I am no expert, just a beginner. But in my opinion boxing gives the best fighting IQ you can get. Boxing seems to have a lot more movement, takes angles into a huge consideration and in general seems very complex. When you watch top fighters fight it is an art, a chess match and it just looks different. Ward vs Kovalev, Floyd vs Mannu ... these were great matches with so much going on, that the regular spectator could not understand. Floyd gets so much hate, because the regular spectator can not understand how magnificent his technique and defence are.
At the higher levels, boxing fight-iq shows. At the lower to intermediate its still not there. Its one reason in ammy MT fighters tend to win more compared to gyms that focus on boxing too much with little MT. After getting decent exp. in and about a high level B or A class fighters (B - 4-9 fights | A - 10+ fights), they start to really shine.
A good thing I will say about boxing, is you learn to cut off the ring and deal with taller opponents early on, I didn't learn it until about a year in of competing. Basically after 3 exhibitions + my 2nd fight (5 events).
I actually liked how PBF got out the ring in a fraction of a second. Pacquiao had him on the ropes, and less than a snap of a finger he was out, and worked from there, now having ring control.
In comparison to MT it just looks like 2 people standing in front of each other and trading kicks. Honestly not too much different from the video posted about the karate spar 1 or 2 pages ago. In my opinion every boxer who has conditioned legs to survive the MT kicks can easily out class any MT fighter with just movement. That is a personal opinion do not hate.
The idea with MT is like being a heavy tank that presses forward like a steamroller, and when things get too jammed, it goes to clinch fighting. Most MT orgs. also take the criteria from boxing that ring control is a category in judging. RC + aggression are tied, so losing on RC will have you losing out on aggression as well. (2/3 categories) Even if you're on the ropes and dominating there, some judges will still say you lost because a lack or RC. I dunno, its really prevalent in America though, there's some obsession with it.
Lastly hands. I am not sure why most people under estimate them here. But hands and punches are the main weapon in every fight. The only negative boxing has is that it trains punches and only punches. So if you would like to compete in another sport, you have to condition and learn a lot. However boxing will give according to me the best base for any stand up sport.
No one actually underestimates hands. Its just there are other tools and ranges, and if a boxer is clueless about it, they'll focus there. If you knew your opponent was completely fresh out of the water with your main strengths, you would exploit it like Hollyood nudes. If you were set on winning, why run the risk of engaging in something you can (even if it may be small) have the change to lose?
I've seen firsthand and fought against people who have little MT and decent boxing and get beaten because of a lack of training in clinch fighting (main reason for their loss). Leg kicks aren't the only thing to condition against, body kicks are a big deterrent if you don't know how to deal with them.
Clinch fighting is nasty and if you are foreign to it, it will cost you.
1) guys who instinctively crossblock to block knees to the midsection This is bad, a teammate of mine fractured his opponent's forearm when he did this
2) trying to body hook punch their way out of a position where their hips cannot generate any power doesn't do much, and worse, might give the clincher a chance to get a double collar (if they were both stuck in the single collar). What they should've learned was to pummel to get a domiant position or to at least escape and work their strengths from the pocket.
This happened to another teammate of mine, both guys were stuck in the single collar, and my friend was working to pummel, but his opponent was tough and didn't let him. Out of nowhere his boxing coach (he had 2 coaches) tells him to body hook, giving up the arm that had bicep control, my teammate secured the dollar collar, then went to town on him and it ended up in a TKO.
3) the basics when getting in the clinch is to go hip to hip, then work from there with your offense. If both guy's hips are away, even if you're getting your head pulled down and don't have the double collar, you can still knee from there. In America, the majority of the gyms are MMA gyms with heavy emphasis on boxing, wrestling, and BJJ in their curriculum. Not too much MT. So alot of them have grappling exp. and going hip to hip without underhooks is a no no that they've been taught from day 1 grappling.
4) Guys will panic if they are new to it, breathe irregularly, sometimes try to muscle out of the clinch while not breathing, and they end up wiping out their gas tank. If they show this weakness, the clincher will seek out to clinch again. This happened in my 2nd exibition, it was by a stroke of luck we ended up in the clinch as I knew how to clinch but not engage it, at the time. When we were there and I realized he was clueless, I found my money shot, and bullshitted everything to get close to clinch up and fleeced his gas tank like a divorce court lawshuit.
Also MT heavily favors taller practitioners given that the taller fighter will dominate 2/3 ranges (kicking + clinching), so its not rare to see taller and stretched out fighters there (eg. 5'9-5'11 at 125lbs). Newer boxers, if they aren't good at fighting against taller opponents, it becomes extremely tough. Given that new fighters are terrible at range and distance management, they don't stay at mid range where they would shine, they usually end up trying to push through and end up trapped inside the clinch.
I know it may seem strange that I'm saying that a taller guy is favorable in the clinch, as the first thought is: close range = shorter guy's territory. Here's why, as a taller guy you usually have a longer reach and your clinch range (depending on how tall) might already be your opponent's punching range, and while clinching, you shooting your hips back to launch the straight knees, you have more ground due to having a longer stride. Those knees with more distance will hurt compared to a short jammed knee strike. Also, for a shorter guy, pummeling out is alot harder and straining on your shoulders compared to someone the same height or shorter.
For a boxer to win, they'd need to adjust to defend kicks, the distance, how to fight in the clinch (staying calm and breathing regularly, while knowing when to work, its like BJJ actually, as the clinch is form grappling), and the lateral movement. In boxing sparring, its okay for me to circle into my opponent's power side (both orthodox, circling to my left), slip punches, and work. With kicks being tossed in the mix, I can't do that. I can slip a cross, but a kick that cuts me in half horizontally I can't, unless I was on the set on Dumbass and purposely want to hurt/damage my ribs.
The thing with competing is, you need to ingrain habits so that your body will run on auto-pilot come fight time. When the adrenaline is surging, and we're in a fight situation, we all lose some cognitive thinking. Its not like someone who's observing from a video on YouTube where we think "We should've pivoted to the left, sweep his lead leg, and blast a knee", if you rarely do things in training and camp, you won't do it in a fight. If in camp you've been drilling 1,2,slip, 3, 2 you'll do that in your fight. Other things you don't do, it won't show. However, if you are a stone cold, calculating individual, it may. I've seen one guy like that, but the guy is a bit of a odd case imo, even then, he's the exception.
It might look like I'm shitting on the sweet science, but I'm not, its just thats the reality I've seen and dealt with, esp. with newer fighters. I think in the long run boxing is very useful, knowing how to cut off the ring, how to counter and deal with hands (while not shutting down), throwing fast hands (everytime I see boxing sparring and mitt work, I'm impressed how fast they are. MT hands look like being trapped in slow mo. compared to them), footwork, and good reaction times are great tools to incorporate for anyone; Boxing imo, is better to transition to MMA than pure MT.
Dutch KB + strong emphasis in clinch fighting is what I feel is the best for MMA striking.