Kubi - nice, somewhat expensive. Good following. I have never used them but I defer to
@Boarderguy and his experience.
Rolock 90 - pretty inexpensive, great system, easy to load. To me they had a little bit of a break in period but now they're great.
Waterproof - somewhere in the middle expense wise (last time I checked). Very hard to load but pretty flawless once on. Can use a different size o ring to make them worlds easier to load.
To me they've all got little nuances. I was in the water at depth when a buddies Kubi popped off.. no idea why, maybe user error? I've never had either the Rolock or WP pop off. You can't go wrong with any of the 3 imo. The Rolock is probably the most secure because it twists on, but reality is they all work great.