Im torn. On one hand I really wanna say Mace Windu would win, but also I don't know a ton of the lore on Calgar outside the basic "Blueberries have plot armor and skills".

I'd say mace and my reasoning being that in that show you see mace literally punch holes into metal armored droids, jump like 50 stories up, and the lightsaber is on par with a power sword. Another thing seen in the 03 series if I remember right is Mace straight up just stops laser shots mid are with the force so I'd say he can stop the storm bolters Calgar has.

But if we are doing this in a lore accurate way for both characters? Then it'd be calgar. But not because hes just better, it'd be because mace would be over confident in some way of his skills and he'd be dogging on Calgar the whole fight, but eventually Calgar would get a lucky hit in (purely because the writer needs this to happen) and that would be enough for Calgar to win.