I went with the theme and how the ability felt. Looked at numbers, but didn't really care. Had a hard time deciding between Kyrian and Night Fae on my monk, but went Kyrian because I didn't want to have to deal with keeping mobs in a line. Once Kyrian is maxed, will switch to Night Fae. Recently got a hunter alt. She's undead, so I went Necrolord. Almost did night fae for the obvious beasty theme, but went necro because she's an undead fighter at heart. Will then go Venthyr once necro is maxed.
Recently looked at logs and holy moly am I glad that Kyrian is bis for monk dps LOL.
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I chose a fun legendary and was middle of the pack dps, then once I made the bis legendary I'm top.