As Sangris said raidbots.com and the simcraft addon.
Also the sim still isn't perfect in the end as it doesn't account for a few things imho - the player, lag/latency, having items have 100% up-time when it shouldn't, etc
So even if the sim says and X item is better than Y item test it in game and see how it feels. If it truly does less damage or doesn't play the way you like don't use said item.
I don't like Vision of Perfection for DH after the nerf :/ I think the beam one and crucible are so good, also Lucid Dreams is actually good to help you with the fury management
Vision has never been good. It's been Crucible r2 as a major until you can get at least r2 of the raid essence. Iris is okay in M+ but I always felt it flowed oddly compared to crucible.
Overall, least for major and imho, Crucible r2, then CLF r2, back to crucible r3, then back to CLF for r3. The other majors are all situational but most can't touch crucible or CLF.
Now for minors that is going to be highly based on your gear. For me iris minor sims better than crucible minor.
Am doing it wrong by following what AMR tells me? Can that website be so wrong? I mean I am just running +10 max and open world stuff.
I'm using iris (major) + protocol (minor), ending with 30k/40k overall
stupid question because i used mostly different ones, but can you use the same essence in "major" and "minor" ? or it must be two different ones ?