A question re the matte, brushed or polished finish on the new CWC divers.

I've had a couple of said watches but I can't remember the differences! I now fancy another (!)
I know there are various configurations of matte top with polished sides, all matte and all polished I think?

I recall reading that some are either brushed or blasted - is this correct and what's the difference? Does a brushed finish show the marks/scratches more or less than a blasted one?

Also with regard to the models with polished sides - Should I find myself all upset that it gets marked are they easily re polished do you know?

Thanks