All the viable trinkets that you can possibly have on Day 1 of Patch 7.2.5 is compared and simmed here. These sims are done using Tier 19 4piece along with the Helm+Bracer legendaries and a 910 Convergence of Fates as the 2nd trinket. 5 minute, single target, at 10,000 iterations each.
The winner is of course Unstable Arcanocrystal. Ursoc's Rending Paw comes at a close second however. Form a group for Mythic EN and get your Mythic Ursoc kill! Chaos Talisman and Fel-oiled Infernal Machine (from Violet Hold and Cathedral of Eternal Night, respectively).
The biggest loser is unfortunately Draught of Souls. Literally any trinket that is at least 880 ilvl beats a 925 Draught of Souls.