Originally Posted by
Nightseye
I would actually imagine that with the 25% bonus benefits to Armor Penetration, Grim Toll would surpass Greatness as a BiS trinket. Preliminary tests on Elitist Jerks suggests that 1 point of Armor Pen is just as valuable as 1 point of Strength, and possibly surpassing strength when you stack past 500 rating.
Greatness Procs for 300 Strength, Grim Toll procs for 612 ArP Rating. Judging purely from the proc perspective, the EP on strength has to almost double the EP of Armor Pen in order for Greatness to be better than Grim Toll post patch (Greatness does last 5 seconds longer than Grim Toll). Most numbers on elitist jerks however shows a near 1:1 Ratio.
Now to compare the passive equip effects. Grim Toll has 83 Hit Rating, while Greatness has 90 Strength. Speaking purely in terms of +16 stat gems, 83 HR = 5.18 x 16 Hit Rating Gems. Since we can't round down when it comes to achieving hit cap, we need at least 5.5 gems (0.5 can be an 8 HR Gem Hybrid with something else). 5.5 x 16 Strength Gems = 88 STR. Of course, this changes quite dramatically depending on how much HR you currently have, but most people with a DMC: Greatness tend to be close to the lower end of the hit cap.