electric
have you tried the new 100c batteries and the 60000000kv motor. cause you'll have to buy that.hahaha
it doesnt matter which ever way you go you'll have to buy/spend and replace gear. you can buy a low priced engine that can keep up with the other engins on the track cheaper than you could buy a brushless system and lipos....
but electric is good if you can afford to stay competitive if racing....