Signets of Suffering vs Close to Death
If you have really low power values the signet would be better. The more power you have, the better % modifiers get. So, for all normal scenarios with full ascended gear and full might stacks Close to Death is much better.
If you’re actually a Power build, Close to Death is vastly superior.
Need to factor in how much might you build around as well.
Might-shroud reaper gains almost double the bonus damage from CtD over the signet.
Considering the fact it’s a waste of a util slot as well (SA and Suffer come to mind as being very strong picks), there’s really no upside unless you plan to play triple signets, which is kinda bad.
Formal Thief Elite Spec proposal:
https://forum-en.gw2archive.eu/forum/professions/thief/ES-Suggestion-The-Deadeye-FORMAL/
https://forum-en.gw2archive.eu/forum/professions/thief/ES-Suggestion-The-Deadeye-FORMAL/