About the RC Motors also, I read somewhere that the RC Motor is generally a very weak motor, since LEGO only ever wanted to use the RC Trains as a transition between 9V and PFS, since they didn't want to keep making 9V but PFS wasn't completely done with development yet, so they just sort of saved money on the motors.
I own both of the RC sets, and Honestly prefer the remotes to the PFS remotes, but generally find the PFS motors to let my train run longer. I sadly do not own any 9V stuff, but really want to convert my lego Trains all to 9V in the Near Future