My favorites are FFV, FFVII, FFVIII, FFX (I would say FFX-2 but fuck, I couldn't look past the shit surrounding the battle system). I like them because for the most part they give you a battle system that is your sandbox to go and do as you please. White mages doing monk damage in FFV, whatever the fuck you want in FVII, FVIII, FFX. FFIX pissed me off with it's stupid abilities on equips and no freedom to decide progression at all, fuck that game. FFXII's gambits can go die in an icy cold wet blowjob in Antarctica. Fuck all that stupid shit.