I actually think they are different things. One is neater (cuffing by folding over and flattening the cuff with each roll so there are no wrinkles, etc.) Rolling is messier (and takes more work for me to achieve no less! LOL) and is just what it sounds like. I *roll* the hem up a few turns and hope for wrinkles and a messy look.
I prefer the roll as it looks more current to me, but I'm from a generation of cuffs and pegs so that seems dated to me. (Unless it's only cuffed up *once* that seems current to me.) Poison eye on my part I think!