This chart, made available through the awesome folks on Hammer of Wrath discord, shows the relative ilvl strength of the various traits. This is single target however, if you're looking for optimal dungeon trinkets I don't know of any research into this.
https://images-ext-2.discordapp.net/...0RU-AEdJqfUeKk
So the questions is, what are you mainly looking to spec for? Single target or AOE?
I think i'd probably just stick with the higher ilvl ones. You may get a tiny tiny improvement to single target but the amount would be so minor you'll probably not notice. You'll probably be better served by keeping what you have for a bit better of AOE.