I think non coated lines will twist and coated lines will only twist on the handle attachment. Coated lines are so nice to put away. I still use my non coated once in a while and hate winding that one up.
also when you are letting it through your fingers to get to the handle in the water the coated ones just glide and the uncoated burn your hands sometimes.
Coated lines do make it impossible to start off the swim platform on a cold day though. You can't let just yourself out, the rope slides through your hands to quickly.