I got non coated drums for my Accent and after one winter I will tell you next time I'll be getting coated, and not just for cosmetic reasons. I wanted to adjust and clean my brakes before winter and I could not get the drums off without damaging them because of the rusted lip inside, so when they do come off it will be to replace them and it will probably require the air hammer.
Most coated drums are fully coated so the all the spots on the inside where the shoes don't rub don't rust to heck.