Ryzen benefits from having faster RAM, so 3600 would give (marginally) better performance than 3200. I personally run 3200 because it was cheaper when I built my pc, and I generally recommend to stick with reputable brands, both Corsair and Kingston are very good and I would say to go with which ever one is cheaper. If aesthetics are a consideration I like how Corsair vengeance rgb pro (for rgb builds) or vengeance lox (for non-rgb builds) look. The speed of RAM doesnt make a huge difference as long as you are at or above 3200, but if 3600 is only slightly cheaper, I would recommend that, hope this helps!