The way you pick up stitches and seam the edges can also be different. They both look nice, very slightly different, and are done differently. It's just a personal preference. You may even prefer one way for open edges, and the other way for seams. They can both work well for both; it really just depends on what you like.
Maybe "controversial" is too strong a word. People do tend to be die-hards, though, either always slipping, or always not!
KnittingHelp Queen Bee
"There is a vitality, a life force, an energy, a quickening that is translated through you into action, and because there is only one of you in all of time, this expression is unique. And if you block it, it will never exist through any other medium and it will be lost. The world will not have it. It is not your business to determine how good it is nor how valuable nor how it compares with other expressions. It is your business to keep it yours clearly and directly, to keep the channel open. You do not even have to believe in yourself or your work. You have to keep yourself open and aware to the urges that motivate you. Keep the channel open."
— Martha Graham