Originally Posted by
Extremity
On purely single target, use the helmet and the belt. The bracers are going to be effectively useless on single target. I mean the helm pretty much is too but idk, at least it's doing something (even though you really shouldn't eye beam on single target, although you may want to when you have the helm? I'd have to check.)
In a permanent cleave/AOE situation, I'd use the bracers and the helm together with Demonic build. You should do some pretty great AOE/cleave damage with those, run Bloodlet and put Throw Glaive back into your rotation.
For most fights in Nighthold, though... I'd have to think about it. Very few are purely ST, Krosus probably being the closest, but there are even adds there if somebody messes up and doesn't soak a swirlie. Keep in mind that on one target the bracers do nothing, it only increases damage after the first target.
The stats of these items are pretty important, too. I said belt/helm for single target, but consider your alternate non-legendary for each slot. Equip a non-legendary for both bracers and helm; if equipping the bracers is a 22% upgrade but equipping the legendary helm is only a 14% upgrade, then go with the helm. Unfortunately, for ST your legendaries aside from the belt are basically stat sticks for you.
For the first fight in Nighthold and anywhere else you go with big cleave/AOE, you have some great legendaries for Demonic build (where you would, as I said, use bracers/helm). OUTSIDE of Demonic build, however, it changes. If you're not comfortable running Demonic and never do, that changes things. You're mainly going to have to decide which of the two (bracers/helm) is a bigger upgrade stat-wise for most fights. If they are both genuinely the same (within like 3-5%, tops) then I would stick with bracers/helm running First Blood; if you do a fight with at least two targets up a majority of the time, but less than 4, run belt/bracers with Bloodlet. Once you get to around 4-5+ enemies up a majority of the time swap to belt/helm with bloodlet, running Demonic if possible. Even if you don't go Demonic, I'm pretty sure that belt/helm would still be best, still using Eye Beam rotationally. I can run some sims to check from you if you're really worried about it.
It's going to be hard to give you a "this is the best stuff to wear" answer as fights vary so wildly. If you can name one (or a few) specific boss battles I can do a better job of telling you what you should do/wear.