I'd probably say Monk.

Since I just don't really love the theme ("it's not you, it's me.." lol, the monk theme is just okay to me) it means picking it up randomly and remembering all the positional and then also all the optimal patterns (its not impossible but it's "extra" to me). Dragoon positional and what have you are easier since there is just less of all of that noise going together. I don't hate it, but it doesn't click for me. I assume others love it though :P.

I did suggest an idea though that I think could help make Monk, and positional in general I guess, easier to pick up with positional optionally being marked on your icons (like notches on the edges of the icon, allowing you to know the positional at a glance and before you need to do it). Here.