The problem with the PS3 version is that it hasn't even been announced for the US, and no one knows if they even will due to the sales numbers of TOV on 360.
Sure, you can take eternal sonata as an example that was ported, but TOV has a ton more extra content, meaning they would probably need to hire the Voice Actors again. There's a interview going around with the Japanese VAs that say they had to record more voice dialogue for this extra content/port, than all of the original game.
I've beat the heck out of TOV on the 360, but I am still going to import TOV for PS3 once it's released for all that extra content. I would say if you want a fantastic RPG, that by itself still has a lot of content and 50+ hours of gameplay, go for it. $23 is a steal.
Honestly, unless you are a hardcore tales fan or willing to wait a long time, the extra content of the PS3 version isn't going to make or break the game, as it was pretty much a complete game on the 360.