To compare the available trinkets I ran some sims with all of the pre-raid trinkets normalized to 850
here. Immaqtpie was asking about Emerald Nightmare trinkets, so here's an updated list that includes those, again normalized to 850:
► Show Spoiler
copy=squirrel
trinket1=elementium_bomb_squirrel_generator,id=137446,bonus_id=1502:3411
copy=alchemist
trinket1=infernal_alchemist_stone,id=127842,bonus_id=669
copy=starlight
trinket1=corrupted_starlight,id=137301,bonus_id=1502:3411
copy=heirloom
trinket1=orb_of_voidsight,id=133596
copy=obelisk
trinket1=obelisk_of_the_void,id=137433,bonus_id=1502:3412
copy=tongue
trinket1=naraxas_spiked_tongue,id=137349,bonus_id=1502:3411
copy=prism
trinket1=moonlit_prism,id=137541,bonus_id=1502:1727
copy=eye
trinket1=eye_of_skovald,id=133641,bonus_id=1502:1727
copy=writ
trinket1=infernal_writ,id=137485,bonus_id=1502:1727
copy=manacracker
trinket1=portable_manacracker,id=137398,bonus_id=1502:1727
copy=stormsinger
trinket1=stormsinger_fulmination_charge,id=137367,bonus_id=1502:1727
copy=figurehead
trinket1=figurehead_of_the_naglfar,id=137329,bonus_id=1502:1727
copy=root
trinket1=oakhearts_gnarled_root,id=137306,bonus_id=1502:1727
copy=horror
trinket1=caged_horror,id=136716,bonus_id=1502:1727
copy=baton
trinket1=devilsaur_shockbaton,id=140030,bonus_id=1502:1727
copy=darkmoon
trinket1=darkmoon_deck_hellfire,id=128709,bonus_id=669
copy=horn
trinket1=horn_of_valor,id=133642,bonus_id=1502:1727
copy=shard
trinket1=chrono_shard,id=137419,bonus_id=1502:1727
copy=stat_int_haste
trinket1=nightborne_researchers_phial,id=134292,bonus_id=1512:1727,stats=1233int_932haste
copy=stat_int_crit
trinket1=nightborne_researchers_phial,id=134292,bonus_id=1512:1727,stats=1233int_932crit
copy=stat_int_mastery
trinket1=nightborne_researchers_phial,id=134292,bonus_id=1512:1727,stats=1233int_932mastery
copy=stat_int_vers
trinket1=nightborne_researchers_phial,id=134292,bonus_id=1512:1727,stats=1233int_932vers
copy=horrorslime
trinket1=unstable_horrorslime,id=138224,bonus_id=1807
copy=bough
trinket1=bough_of_corruption,id=139336,bonus_id=1807
copy=sinew
trinket1=wriggling_sinew,id=139326,bonus_id=1807
copy=wind
trinket1=twisting_wind,id=139323,bonus_id=1807
copy=plaguehive
trinket1=swarming_plaguehive,id=139321,bonus_id=1807
Here's a quick and dirty single target Patchwerk sim of my current character with each 850 trinket alone:
(The character has 19350 int, 5192 crit, 8244 haste, 721 vers, and 2536 mastery without any trinkets on. The super low versatility explains why the versatility stat stick and root do so well.)
Twisting Wind and Swarming Plaguehive both sim pretty strong. I think Twisting Wind is not nearly as strong as the sim suggests though. It summons a fairly small tornado that moves in a big circle. A single target standing still will definitely not get hit every second for 10 seconds like it does in the sim.
Plaguehive is looking like the best single target option from Emerald Nightmare to me. At equal 850 ilvl it is still not as good as tongue or baton, but we're likely to get plaguehive at a higher ilvl than baton. Mythic titanforged tongue is definitely still the best overall single target option though.