After watching a speed run lets play by awsome/summer games done quick of FF8 and having played it I think it's the easiest. 10 and 7 are reasonably easy too. i like 9 but cant say much for it's difficulty.

If you want a hard JRPG get a megaten game, Persona and SMT 3 hand me my head quite frequently. Digital devil saga is quite difficult as well.