the 7XL get's my vote.. I would take the 7XL. the 7XL is the best motor you can get for the amount of cells and the weight of the vehicle.

You go serum. The 7xl is a good motor. Serum has some experience and know how. I listen to serum and mike. They know more than me. I had a 7xl and was happy. It just crashed and tore motor apart. Need another big motor the little ones don't do justice.