Devourer Demon Hunter trinket simulations are currently showing non-mastery trinkets as a lot weaker than they are. The reason is the used pot. A fix will get deployed soon.

bloodmallet

This site provides an overview about several simulateable aspects for almost all specs in World of Warcraft using SimulationCraft. These overviews are an entry point. You can generate your own charts by becoming a Patreon.

For indepth information about your spec use your theorycrafters guides.