You don't need 3 channels unless you have a use for it. Throttle and steering, 2 channels don't need anymore than that. I have no idea what features or settings the dx2s has but I have a DX3S and run 1/8th buggy and truggy and only use the telemetry on my truggy and that doesn't use one of the channels but have never and probably will never use the 3rd channel. Get the 2 channel and use the extra cash for another reciever.