Yes that solder will work fine.

.062 is the diameter. I personally always use the thinnest solder I can find. Usually Kester Solder or the Radio Shack 60/40 if I run out of the Kester before I order more.

Yeah, I know... I looked for the largest gauge they had, but wasn't sure if it was large enough for the gauge of wire on the Novak ESC. Why do you use the thinnest you can find?

And they had silver solder... would that work any better, as far as limiting resistance?

Mostly just personal preference. It's easier to work with and easier to control solder flow. I do a lot of soldering (but not daily) at my real job on very small electronic components from time to time. That's the reason I use the skinny stuff.

Silver Solder won't really work any better and it takes a lot more work.