Leaderboard

There are all sorts, from a plastic bar with elastic, up to ones that you can roll on without affecting tuning (apparently). The teeth you speak of are probably just contoured rubber and just look different. For the most part, it’s find an action/mechanism you like. I use a Shubb that you have to set the pressure with a screw and then apply that pressure with a lever, I find this type of one works better for me as I can set how hard the strings are held down, rather than a constant, unadjustable spring pressure. If you use a capo on a number of different guitars with varying neck thicknesses, a simpler ‘one touch’ action may be for you.