[RC-Monster Mike]

Actually, Serum, I would put my money on the 1940 over the wanderer/feigao xl motor in terms of power output. It simply is a better motor, though the price is much higher as well. The 1950 motors also carry a 5mm shaft, and would definately out power the wanderer xl. The true benefit of the "19" series motors is the partial load efficiency(r/c cars are most often under partial load) and premium building materials. They will provide the power with greater efficiency, cooler temps and smooth performance.
Having said that, I doubt the average user would detect a difference in actual driving performance vs the cheaper wanderer/Feigao motors. If you are budget restricted, the wander/Feigao is the obvious choice. If you simply want the best, the micro controller and Lehner "19" series motor is the premium system.