Mid-Large scale he good if not great. Succ I think is better if small scale (based on my exp in aos cuz i never won a single match against a true succ musa player). Demands higher apm thou than awk.
Paired with a player that can do high apm with ease, Succ musa really great in very smallscale pvp. Not a succ player, but I tried going aos with it once and damn deals more dmg, debuffs, and CCs than what I do with awk (both running same eva gear and crystal except ignore knockback/floating ones). Though I still would continue going awk cuz I love using crescent blade, I definitely will tag and lvl up my succ along and use it time to time.
fun fact is musa/maehwa succ is like the only class that can get super aggressive with the cancels compare to any other class and can do huge damage in few seconds. love the montage
Man I wish I could help you, but I dont grind with succ musa anymore, as it's ridiculously not worth the effort. But if you are really interested do check Ahzure's pve guide my man is a machine.