I burnt mine up trying to start my car so now I'm looking for a good, strong, new one to start my .21 1/8th buggy. I've looked @ TWRHBY's but there are many to choose from. Which is better for my car; the box with 2 -550 motors, or the one "high Torque"motor? Both say for off road 1/8th. Is the OFNA brand the best?