If you're running a single motor with each ESC, the 15a Electronize will do. If two motors; the 30a is advisable.

I can't comment on the Scorpion or Sabertooth ESCs as I have never used either.

However I don't really recommend the Electronize. I would have a year ago, but with the Botbitz guys in Australia now making 10a, 25a, and 85a ESCs specifically for robot use, for less than Electronize kit, much smaller and lighter, way more current handling for your buck, significantly nicer motor control and genuinely helpful, smart people that respond to all inquiries behind it all, I recommend Botbitz!



For 2 motors per ESC I'd go for the 85a (same price as a 30a Electronize!), or if just 1 motor per ESC, the 25a model. You may even be able to get away with two on the single 25a, not sure if that has been tested yet, though.