Alright, so this is the comparison I came up with over the course of the last couple of hours. In order to try and keep trinket interaction working, I made a list of the best combinations of trinkets, from Heroic TF down to LFR. Gear will interact slightly with this ranking, but hopefully not too much. If in doubt, WrathCalcs yourself. In the end we come to a general conclusion based on the ranking data.
For the sake of this comparison, I'm using the 5.3 T15H BiS list and changing some reforges/gems/neck piece depending on whether or not Wushoolay's is being used. If it is, I swap the Lei Shen neck out for the Passionfire Choker, to reduce the overall amount of hit on everything. Note that this is only an easy change when you consider Ra-den loot: if you're gearing up, Wushoolay's will only be at the ranking below if you can get rid of the hit. If you can't it's the worst of all the options (for that bracket). Also, upgrades aren't properly increasing the proc effect of the trinkets in the current WrathCalcs, so I evaluated the choices without any upgrades (to ensure the static stats on the trinkets that do get multiplied don't skew the data).
Additionally, SPA = the Shado-Pan Assault Valor trinket, and LotC = Heroic Light of the Cosmos with 2/2 upgrades.
Trinket Combinations: Most DPS to least
- Cha-Ye's + Wushoolay's (Heroic TF)
- Cha-Ye's + Breath (Heroic TF)
- Cha-Ye's + UVLS (Heroic TF)
- Breath + Wushoolay's (Heroic TF)
- Cha-Ye's + Wushoolay's (Heroic)
- Wushoolay's + UVLS (Heroic TF)
- Cha-Ye's + Breath (Heroic)
- Breath + UVLS (Heroic TF)
- Breath + Wushoolay's (Heroic)
- Cha-Ye's + UVLS (Heroic)
- Wushoolay's + UVLS (Heroic)
- Cha-Ye's + Wushoolay's (Normal TF)
- Breath + UVLS (Heroic)
- Cha-Ye's + Breath (Normal TF)
- Cha-Ye's + UVLS (Normal TF)
- Breath + Wushoolay's (Normal TF)
- Wushoolay's + UVLS (Normal TF)
- Cha-Ye's + Wushoolay's (Normal)
- Cha-Ye's + Breath (Normal)
- Breath + UVLS (Normal TF)
- Cha-Ye's + UVLS (Normal)
- Breath + Wushoolay's (Normal)
- Wushoolay's + UVLS (Normal)
- Breath + UVLS (Normal)
- Cha-Ye's + SPA (Normal)
- Wushoolay's + SPA (Normal)
- Breath + SPA (Normal)
- UVLS + SPA (Normal)
- Cha-Ye's + Wushoolay's (LFR)
- Cha-Ye's + LotC (LFR)
- Cha-Ye's + Breath (LFR)
- Cha-Ye's + UVLS (LFR)
- Wushoolay's + LotC (LFR)
- Breath + Wushoolay's (LFR)
- Wushoolay's + UVLS (LFR)
- Breath + LotC (LFR)
- UVLS + LotC (LFR)
- Breath + UVLS (LFR)
What does this mean overall? Well, we can see a general trend here, but also slight changes if you have access to the two additional trinkets: SPA in normals and LotC in LFR. In either case, SPA is the worst of the normal trinkets and LotC is about even with Breath in LFR.
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In general:
Cha-Ye's > Wushoolay's > Breath > UVLS
**PLEASE NOTE** Wushoolay's is only better than Breath and/or UVLS if you can get rid of the hit. IF YOU CAN'T, it's below all of the options for that bracket.
What's interesting is that for heroics at least, is that this has spurred a small change in this list - like I said earlier, swapping out the necks and Breath for Wushoolay's is about a 1k increase, and this is because the Ra-den loot mostly lacks Spirit. It doesn't change the normal list since there's too much Spirit on the normal options, but at least for the heroic list it does. I'll update the OP after I post this.
Let me know if you have any questions or you think I've made an error somewhere (probably).
Edit: If you're interested in the actual DPS numbers - http://i.imgur.com/Wx3szRP.png