2D Sonic CD or Sonic 1 on genesis

3D Sonic adventure 1 or 2 on dreamcast but mostly 2

Best ever Sonic next gen!!! no just kiddin! Maybe Adventure 2 on Dreamcast only

Best

1.Sonic Adventure 2 (DC)

2.Sonic Adventure (DC)

3.Sonic The Hedgehog (GEN)

4.Sonic CD (SCD)

5.Sonic 2 And Knuckles (GEN)

6.Sonic Shuffle (DC)

7. Sonic Rivals 2 (PSP)

8.Sonic 3 and Knuckles (GEN)

9.Sonic Riders Zero Gravity (PS2)

10.Sonic R (Any System)

Worst

1.All Sonic Game Gear games

2.Sonic 3D Blast (Any System)

3.Sonic The Hedgehog (360/PS3)

4.Sonic Heroes (Any System)

5.Sonic Spinball (GEN)

6.Dr. Robotniks Mean Bean Machine (GEN)

7.Shadow The Hedgehog (Any System)

8.Sonic And The Secret Rings (Wii)

and thats all I can think of