Ninja and RB both have onroad and offroad engines. To recommend one you have to tell us if you are onroad or offroad. Either way my vote is for the RB, as they are amazing engines.
OOMSGFX.COM (no longer painting, but take a look for fun!), Roadrunners RC Club
"Racing drivers have balls, unfortunately, none of them are crystal" (David Coulthard)
"I believe the average IQ of a NASCAR fan is only marginally above the things that hit the windscreen during the race. "