I'm not sure, here we only have L. styraciflua, many of them planted as street trees.
I have one L. formosana seedling planted this spring (thanks Michàl from IRL !) but it's still too small to make the difference. I think one of the main differences is the bark : L. styraciflua has a coarse bark, almost a cork bark, whereas L. formosana seems to have a smoother bark. L. orientalis (never seen any here) is said to have smaller leaves.
But I'm pretty sure there are posts about sweetgum/liquidamber/Liquidambar on the site...