Well Tituan is the one to listen to.
I just have an 86cm (Axis) mast and a 110cm mast (tiny race foil). I vastly prefer the longer mast for almost all things, it makes transitions better, upwind better, gliding better, jumping better, etc.
Where it is not better is in paddling out, I'm worried about hitting the bottom. It probably is worse at doing surfing turns since it's so long, I think it makes turns more drawn out.
(imho) I will never own anything shorter than mid 80s, it seems like you need that much height to make turns without catching a rail or breaching. Shorter is only for if you're hitting the bottom all the time prone foiling.
This is a 96cm mast.