the pro would be more ubuntu studio packages with curated and custom themes that make it look like windows/mac and other variants, which anyone can do themselves after like an hour or so googling gnome extensions and customizing them, they do look decent and ofc it goes towards continued support for both the free and pro version, if you like them its not a huge deal

Personally I think half the fun of linux is picking and customizing a de yourself to get a look only you have.