What are the strongest DPS specs in WoW right now?

honestly it moves every tuning pass, so any list someone gives you is stale in a few weeks. what i do is look at the current top parses on Warcraft Logs for the content you actually do (raid and m+ rankings are very different) and then sim my own character on Raidbots. the gap between the top 8 or so specs is usually small enough that playing one you enjoy well beats playing the meta one badly.