For just bashing around, I'd say the .28 will probably be more fun than the .21...especially if the Hyper is the 8-port version as the bigger motor *should* have significantly more torque. Somone correct me if I am wrong on that as I have never owned a .28, just gathered it from reading here. More torque=more wheelspin=more fun. On the track though, I'll take my little Thunder Tigre .21 over the baddest .28 on the planet.

-rocky b