RE: Micro-T or Micro-B
Just bought a Micro-Baja Monday and love it. If my son was old enough, I would get him one also.
Don't have to mod it out of the box, like the mini, to have fun with it. That was one purchase I regretted. The mini is under-powered stock, but the micro has plenty.
My pug is scared of it. I've made sure she gets her exercise since I bought it.