On some breeds, the head shape calls for a pea comb. On other head shapes, the head of a rock absolutely calls for a single comb and a rose comb would look ridiculous. Just sayin'. The Wyandottes, Chanteclar and Buckeyes all look fabulous. Truth is, I've always been a single comb guy. Don't know why even.
That said, an over sized, exaggerated comb is a fault. I honestly breed for shorter, single combs. That looks the best to me. To each his own.
The whole "frost bite comb phobia" is for others threads here. Lots of them of them to dive right into.
True O.T.'ers don't pay much mind to the issue. It seems to be one of the major concerns of folks who have those itty, bitty, teeny, tiny coops in the city. Apparently, from what I can tell, frost bite seems to target urban chickens to much larger degree than birds raised out in the country.