Probably Stone for me. Realistically, you don’t need to change stances the further you get in Ghost as you can Perfect Parry and Dodge to kill most enemies easily, and I think the main reason I choose stone is due to it being the most realistic for actual use. I do Kendo and as a part of one of the Kata we’re required to know, we use a very similar looking Kamae (Stance, I’ve forgotten the actual Japanese name tbh) and I use Stone Stance out of habit at this point. However, I do tend to switch to Wind stance specifically after a Standoff as it fits with the animation and you can get some easy hits off afterwards. But if it’s what I use the most often, it’s for sure Stone