they are all good. they all have there good and bad. The air will some times get moister in the lines in the winter and freeze and block the air so it won't lock or unlock very very rare and easy to fix.they did have a o-ring problem but that is mostle installing.The elec. is the easyest to install but you have more little things if you don't instaal it right wire braking fuses blowing switches quit working also easy fixes.the cable dosen't have those problem but you can't ceenk the cable so you have to run it so it is stait and wide turns. or you can add a elec. or air selanode to work it then you are with the same problem as the others.the good is they all are locker.So pick the one that you can work with and injoy it good luck wheeling.