I heard the remaster version with FFX-2 also has Final Fantasy X - Will -, an audio drama that happens after the events of FFX-2.5 (or FFX-2 Last Mission. I think they're the same. Perhaps it's different things.). Edit: FFX-2 Last Mission and FFX-2.5 are two different things.

So, basically, to get a bit more of the world of Spira, the remaster version might be better.

I also don't know, but I think the FFX-2 of the remaster version has some extra dresspheres that there aren't in the PS2 version. But I'm not sure.

The Remastered should be cheaper than 40 USD are you buying it off psn or Xbox marketplace? I would call your local Gamestop or Game store to see if they have a cheaper copy for less. Is worth getting over the original? You get better graphics and the option of both the original and remastered soundtrack. You also get the epilogue and X2 on there also. It's really up to you at the end of the day but I would recommend getting it for cheaper.