Only exclusive HD fighter I can think of is Dead Or Alive 4 on the 360. Otherwise both consoles have the same fighting games.
As far as JRPGs go the 360 probably still has a small lead, but the PS3 is catching up quickly and will provide more JRPGs in the future.
So yeah sure get a PS3.
EDIT: Well if you count Demon's Souls (which still isn't out here in Europe) as a JRPG, then the PS3 has probably the best library in that genre.







