This was posted in EJ thread, positing it here since the results are quite clear.
http://simulationcraft.org/406-6/Dru...s_T11_359.html
Generally speaking the only blue trinket that is really worth it is the Serpent Figurine. As you see from the list only Gale and Hourglass are competitive, but still lower than most epic trinkets except Slump of Time.
Now looking at the top, DMC:V is above everything else as we knew, with the Serpent Figurine being significantly higher than the epic trinkets, who are all more or less clumped together: mirror, alchemist stone, bell and heart. I'd say which one to use depends on availability and current needs. The big plus from the stone is that it stacks an impressive amount of int (351, most of all trinkets) coupled with a ton of haste, which is still our most desirable secondary stat, and it helps reach the next haste breakpoint. The potion effect isn't that bad, although I tend to use Volcanic potions, it's nice to know that I can self-heal 30-40k in a pinch with a mystery potion (I'm not mentioning mana since running oom simply doesn't happen, short of being battle-rezzed with innerv on CD, and even then it's usually not a problem).