I think that fight depends on things

Alive versions, Artoria stomps, unless she doesn't have Avalon then it's probably more 50/50 for either but if Musashi was able to fight toe-toe with servants when alive, yeah then it's probably more Musashi.

Servant versions, I will use Saber Artoria and not Lancer or smth since, yk. That one is more complex now as I can see it as 50/50, even with Artoria having Avalon due to Musashi's Zero state but also that slash she used to seal wormhole in Olympus. While sure, the latter would make it a draw but still.

Overall, Alive versions, Musashi probably wins but Artoria can also win while Servant versions, it seems Musashi will win, even if she will have to make it a draw between them.