I would still put Chainer higher given what he has to work with in Mono-B or Gitrog actually given how his ability works with the graveyard and cards entering it or maybe if you are pushing me Mimemoplasm.
Teshar is very good (I have found more benefit personally in hiding a Teshar deck inside a 2 color deck with a different Commander for support) but not even close to best.
Why would nissa be a marquee reanimation commander? Surely you mean chainer or karador or Alesha or teneb...
Reanimation is the wrong term I used, I mean graveyard as a resource (I edited the post to reflect this). Glissa (you had me confused with the Nissa :P) is another commander that can return specifically artifacts. Teshar is great to combine with artifacts because of Salvage Scout and Restoration Specialist, along with the other creatures that with converted mana cost 3 or less that return artifacts from graveyard.
The reason Alesha, Karador, Teneb are nowhere near as potent as Teshar, is that they are restricted to one activation a turn, even if they do different things. Chainer, Dementia Master is basically restricted by mana needed, where as Teshar can trigger for much cheaper interaction.
I have absolutely no problem in claiming Teshar, Ancestor's Apostle reins supreme in being able to use your graveyard as a resource, just because you get to trigger it multiple times in a turn, if not infinite.
I feel like you are blinded by a recent deck if you actually feel Teshar reins supreme at this, I wouldn't pick out Alesha or Karador myself either but I would pick out those colors before I would pick out a Mono-W deck.
Because the important part about GY stuff is not the actual engine you choose because there are so many of them it is how you get the cards there in the first place and Mono-W is by far the most inefficient at doing that.
It is noticeable that the other thing white does really well rarely comes up in this thread because it becomes rarely relevant in Commander for a number of reasons being Life Gain, a lot of white card space especially in constructed sets goes to a mechanic that becomes not very good in this land of Commander damage and board killing combos, that and most of the ways to really transform this lifegain into ways to win are more often than not on cards that are not just white, or that other archetypes can just do better (like Aetherflux Reservoir).
(Also added on to the others mentioned in this thread Heliod, God of the Sun can be real good)
Teshar is very good (I have found more benefit personally in hiding a Teshar deck inside a 2 color deck with a different Commander for support) but not even close to best.
I feel like you are blinded by a recent deck if you actually feel Teshar reins supreme at this, I wouldn't pick out Alesha or Karador myself either but I would pick out those colors before I would pick out a Mono-W deck.
Because the important part about GY stuff is not the actual engine you choose because there are so many of them it is how you get the cards there in the first place and Mono-W is by far the most inefficient at doing that.
(Also added on to the others mentioned in this thread Heliod, God of the Sun can be real good)