Well I dont know much about banjoo kazooie but I know that halo 3 is 1 of the best games for the xbox 360 online and 1 of the highest selling games for the xbox 360. I have halo 3 and let me tell you it is AMAZING online ofcourse. Also halo 3 graphics are better you can have up to 16 players in 1 game online. You can also go on something called theater in halo 3 wher you can watch videos of the games you played online or by yourself on campaign. you can make your own maps, take screenshots in theater, play up to 4 people in the campaign and alot more so ya definetly go with Halo 3 =)
