Since you are talking two wheel drive, I guess that you are looking at a 1/10 scale vehicle. I'd go with the Revo. Four wheel drive is a no brainer for me. Better handling and better traction for tearing up the terrain.

If the terrain is really rough out there, you might also want to consider a 1/8 scale truck. I have an 8ight truggy and it is pretty tough. I just adjust the ride height with the tires. For the track I run MT tires and for climbing over stuff, I go with 40 series Moabs. I also think that the 1/8 scale trucks lend themselves to electric conversion better than the Revo.