Mine have survived the amp draw just fine for 15 years, same switch.
As for switching the hot or the ground, you can do either. There is a fallacy that if you switch the ground that you don't get arc's but that isn't true as you are still breaking or starting a circuit--Just disconnect either the hot or ground from your terminals on your battery and see if one sparks... they both will.
However I switched my hot, not the ground, and I have a very strong opinion about that. If I switch the ground on my winch, then I always have a hot wire running up to the winch. If I get into an accident at any time, I can create a ground path to that hot cable. If I switch the Hot cable like I am doing, and anything happens, it is impossible to create a short.
I'll stick with switching the hot unless someone has a better rationale as to why I should and/or a flaw in my logic. And if that does happen, I will rewire it.