So one gear difference? I always thought the RX came with a very expensive 6 button controller and a letter 'x' silkscreened on the console.
For most games, 2 button controllers are fine (maybe 3 buttons if you wanted easier Start or Select button or hands-free auto fire on those like slo-mo) Given the choice, skip those that has 6 buttons controller to save on money unless you absolutely need matching RX controller for RX console. Get whichever you can get cheap.