Probably velidreth for solo content like vma or kraghs for single target damage on group bosses depending on how much overall penetration you have. Selenes is fine. Honestly it's all coming down to like maybe 1k more dps or less. Unless you're min maxing for speed runs then don't worry. Overall for both single target and aoe damage I'd say velidreth is the best.
Probably velidreth for solo content like vma or kraghs for single target damage on group bosses depending on how much overall penetration you have. Selenes is fine. Honestly it's all coming down to like maybe 1k more dps or less. Unless you're min maxing for speed runs then don't worry. Overall for both single target and aoe damage I'd say velidreth is the best.
A lot less than 1k DPS difference between sets, for the damage proc. The best sets give a bit over 1k DPS, the others give 6-8 hundred DPS. Harder to quantify the 1pc bonus, but veli is hard to beat with both good damage proc (that can hit more than 1 target) and a 1pc bonus of weapon damage. Selene's isn't very good IMO, proccing off just direct damage, nightblades are the only ones who could maximize it's uptime; 1pc bonus isn't the best either.
For single target DPS you're better off not using a 2pc monster bonus.