G.U., in my opinion, has better graphics and a much better battle system. The only problem: Atoli! xD She's the most annoying character in the game, and the relationship between her, Haseo, and Shino... ugh. However, I do like the story in the first game(s), whereas I found the story for .Hack//G.U. Rebirth to mainly circle around the Demon Palace Tournament... it was kinda dull. However, I have to say that Reminiscence really steps up the story! AIDA is a much bigger threat in the second installment, regardless of how annoying Avatar Battles are LOL. And... the thing with Balmung, Orca, and Tri-Edge (Kite)... That's amazing, and it's going to keep me thinking for the rest of the trilogy!