Durability and part support are the two biggest factors. I havn't heard anything bad about HPI's cup racer. And the ABC Genetic is a rare car on the track. Unless you know where to get spare parts, easy. The Genetic could be a hard car to keep running, if you manage to brake something. The durability on either of these cars is a big question mark to me. I haven't heard enough of the bottom line details to side with one car, or the other.