I use all time zarkares. Windigo is the mix of the torso for psychical and Heath opponets, but... in my opinion, this is not good torso, in fact, he is useless for even everything. Raids? Very bad idea. You never win full raid on good place with windigo. Arena? Only to 10 rank, because psych. res with max Platinum fortress, is only 144 res. And other res? Only 20 explosive. And łów HP. I win with every player with windigo. From 3 months, I don't loose any battle with windigo player. Maybe 20 kg less, 30 HP more, but... zarkares have more Heath, the most explosive res, from all torsos and is more frequent than windigo. It is not for everyehere, surely dont use it on arena. Similaty as windigo, if you dont got Heath opponet, you most probaly loose. This torso is for raids, titan and first month on arena. And nightmare... hmmm nobody use this. This is so weak torso. Only for sometimes in raid, for many modules.
SO:
Windigo - weak, but od you dont have better - arena
Zarkares - Raid, titan and low rank
Nightmare - a few high raid types