I did some testing with the trinkets just now, found craddle really low, since you can't keep it up 100% of the time. I used this gear just changing the trinkets (I can't link anything yet so if you want to see the gear just remove the spaces) http :/ /us.battle .net/wow/pt/character/azralon/Maskin/simple
I got those following Results:
Trinket1 + Trinket 2 - DPS -Time- Amount of damage done
Draught + Convergeance - 782k - 5:29 -254.93m
Draught + Cinders - 784k - 5:47 - 271.35m
Draught + Craddle - 782k - 5:24 - 253.43m
Cinders - Craddle - 766k - 5:45 - 260.46m
Specter of Betrayal - Craddle - 783k - 5:22 - 249.2m
Specter + Cinders - 830k - 5:26 - 268.95m
Notes: Did not test Engine of Erradication; Used flask and food; Did not have anyone around using Burning Cinders; Have not dropped under 80%(meaning Craddle was at full effectiveness the whole time); Have not Used the execute rotation(meaning this is only for 20%+ of the boss)
I actually got really surprised on how strong Specter of Betrayal and Burning Cinders are. I think definitely that Cinders will be a BiS but I still have my doubts about Specter, maybe with the new tier it could be better to use some more haste.