PS3 - won't come away disappointed either.
I can't really agree with that last remark.
The Last of Us is one of those rare pearls whereby the graphics are really not the important. The important factor about TLOU was the storyline and the characters, both of which were extremely well thought out, scripted and acted. This is a game that has soul rather than pixels.
Updating the graphics will not change the games appeal, it is/was already an excellent game, so the new graphics wont really give it any new pulling power.