Of course, if you have a PSP, you may as well get the updated version. I actually enjoyed playing the "no-frills" (read: no voice acting) GBA version. At this point, I don't think it's reasonable to recommend playing this particular version of the game, unless you absolutely loathe voice acting (and/or refined graphics, and/or the PSP as a platform). Whichever version you'd prefer, though, I have to recommend this game. Riviera and Knights in the Nightmare will only suit certain peoples' tastes, but I think Yggdra Union has a better chance of appealing to a wide variety of tastes, even with its complex combat system.