Im kinda late on this but im going to make it short and simple. According to the list I put about your favorite 3-D sonic games, here they are:

5. Sonic Riders

4. Sonic Heroes

3. Sonic the Hedgehog [xbox 360/ps3]

2. Sonic Adventure [DX]

1. Sonic Adventure 2: Battle

So there you go, yea I agree with a lot of you about sonic adventure 2 battle being your favorite 3-D sonic game.