studio pierrot mightve made bad work (but i wouldnt know bc i dont watch TG or black clover), but i brought them up because they not only made a pilot for hxh, but they also adapted yu yu hakusho: another manga of togashi's. which was very well recieved as far as i know. since theyre already familiar with togashi's work, it wouldnt be difficult to cover HxH. if they do fuck it up though, i think the impact would be much bigger so im not sure if theyd dare to fuck it up.
madhouse is pretty inactive aside from doing 2-3 anime a year, and they arent in the same glory as they used to. last time i heard anything in the mainstream was people complaining about CCSakura:Clear Card arc. but i see why people would rather stick to the same studio who made the 2011 adaptation of HxH.
WiT is a solid choice, but their most popular work often get transferred to another studio after doing a first season (like AoT being transferred to Mappa). i don't want animators to suffer if WiT only makes one season and transfer the rest of the work to Mappa.