aight so here are the arguments for both....you decide
Freddy: dude is bad-ass. kills you in your fucking sleep. does each killing in a distinct and different way, very original, and he says some funny shit to you in the process, he does his killings with style. plus how you gonna fuck with a dude that gets you in your sleep? you can't help but sleep at some point
Jason: giant mobile slaughter house with a hockey mask. dude is fucking gangsta. kills everyone in his path, doesn't give a fuck about nobody. doesn't say shit, just slashs and dips. basically impossible to defeat, he's had everything happen to him and he keeps coming back.
my vote goes to Jason, mostly cause i liked those movies better, but also cause i prefer the simple slasher style kills, violent but easy, none of this complicated fuck-you-up-in-your-sleep shit. Jason is more believable, Freddy, you have to believe in where as Jason will get you no matter what