To be fair, every decent PS2 FPS was also ported to the X-Box or PC. I agree that the PS2 has a greater variety of titles (you won't see anything like Rez, Ico or Disgaea on a Microsoft console in the near future) but if you're after a reliable console for popular software, the XB360 may be the way to go. That said, if FF is that important to you then you should buy a PS3, since that'll have your favourite game series, as well as plenty of other decent software to back it up.

But what you have to remember is that all of these consoles will be outdated in a few years time, and you'll be able to buy them cheaply enough to catch up on any games you missed out on. On balance, I'd say it's probably best for you to buy the PS3, and then a few years later pick up the XB360 and check out its back catalogue. That way you get the best of both worlds.

Or you could just screw them both and buy a Revolution.