I dont know if you are trolling but I would go with Muay Thai just because it has more things you can work with..Elbows,knees, kicks, punches,clinches..
Both are good styles, but muay thai has a lot more aspects to its game. You'll develop good kicks if you go with karate. I'm assuming this is kyokushin or some other form that practices full contact sparring.
For a complete standup you really need a mix of MT, Karate and Boxing. You can also sprinkle on whatever else you like. A little TKD for high kick flair, some JKD, some Kung Fu, etc...
If you can only do one, MT comes closest to being complete, but like Joe Rogan said (lol) its a brawler style and low on technique high on throwing lots of techs out in a round. It lacks a lot when it comes to kicks that you can only get it Karate. MT also has punches but nothing like Boxing. I would start with one and be prepared to add in the others if you want to be well rounded.
Rogan is the worst source for striking information. The guy knows his BJJ, but in anything else he's pretty retarded.
I dont know if you are trolling but I would go with Muay Thai just because it has more things you can work with..Elbows,knees, kicks, punches,clinches..
And karate doesen't utilize these techniques? I'm sorry but you really don't know what you are talking about. Please do your research before you go start giving out advice.
Karate's bad points:
-too much time spent on technique rather than actual fighting
-no full contact sparring (for the most part)
-A lot of its techniques quite simply just don't work on a real fight.