Serenade and Fungaflor seem to be the best (or at least the most popular among pro growers) for limiting/controlling PM once you already have it.

Growroom humidity control (under 50% for sure) seems to be the most effective at preventing the start of PM. Fungaflor and sulpher burn both can help prevent the start of PM if used early and especially in conjuction with low humidity in the growspace. Sulpher burn can be a bit tricky and if overdone even a little bit it will burn the big fan leaves especially if you do it with the lights on (I have done this very thing - not good)