I judge slasher movies on many different merits.
How cool is the Killer? Killer has to be interesting....
Friday 13th - Something we know is already dead, strong as fuck, possessed, hell bent on destruction, and supernatural. His mom was a normal angry person and Roy was just a demented normal person, both didn't show signs of being more than human and were believable in their roles, albeit I enjoyed them less.
Halloween - Normal guy who is sneaky-ish depending on what movie/reboot he is in (he walked dow the FUCKING ROAD in the newest one, WIDE OPEN, PLAIN SIGHT), with peak human strength, and apparently age doesn't play a factor with
Could they happen and/or are they believable? I like to think what I would do in certain scenarios when watching these movies, and this helps.....
Friday 13th - No. Except for when his mom and Roy were killing.
Halloween - Yes
Are they enjoyable and why? Whether it's believable or not, is it at least entertaining?
Friday 13th - Yes. Gruesome kills, different Jason styles, different locations, and nudity throughout. F13 movies knew what they were, and knew what the fans wanted.
Halloween - Sometimes. Kinda. Rebooted to death, but great kills none the less. Halloween fans have had a roller coaster ride with all the reboots, that I may have mentioned a time or 6.....
Does the killer and the motive make sense? Why is he/she killing, and what fuels them to kill more?
Friday 13th - As much as I would like to say no... Yes... They tend to make sense. All but the 9th installment, Jason Goes to Hell. The progressions from the first movie and all the motives stayed in check, and his motivation throughout to kill young teenagers and counselors continued to make sense, as they all neglected him to go off and have sex and left him to die.
Halloween - No. He was hell bent on killing his family for an unknown reason, then just kept killing. Then reboot, more killing, then reboot. Search for next family member, then Busta Rhymes, then last Dr that tried to help, etc;
Would I still want to see a sequel/reboot with more of the same in it?
Friday 13th - Hell yes. Start from scratch, pick up after the last F13 movie, whatever. I want to see Jason Vorhees in all of his glory anytime
Halloween - Would have answered yes before this last reboot, but the way they are still 100% completely clueless on how to kill a man and make sure he is dead, cremate his fucking body, just baffles me. I was REALLY excited for this reboot, and I left the theater extremely disappointed....
Friday the 13th and Nightmare on Elm Street movies maintained their identity throughout, well at least until the latest Freddy movie hit anyway. These two juggernauts hit it big early, and kept the same formula the entire way through. Hell, even the newest Freddy movie wasn't AWFUL to my standards, but it did miss Robert Englund in a HUGE way.
Halloween never really hits it's stride, and you can tell that if you watch the originals, then the Zombie ones, then the Activia one. Was he JUST human? Was he the most stealth stalker/killer around? WHY IS HE KILLING???? They tried to give him a backstory later in a reboot, but he was already an established centerpiece to a whole movie universe, and it just didn't fit.
Oh shit, yeah, you asked a question....
My answer would be Friday the 13th. These movies are fun and timeless to me.