The twist to release cable key rings are nice, but I've come to distrust their strength. I pulled on one of mine and it popped apart with very little effort. It will still close, but now it come apart with no warning and no effort.

I have the same brand that close with the ball end locking into a (somewhat) keyhole shaped notch on the other end. They have not come apart with a slight pull, but will come apart if lateral pressure is applied to the latching area. Pulled my keys out of my pocket, only to have several keys and pieces of kit hit the floor while a few stayed in my pocket.

Now I just use both types to store spare keys, and never carry them where it might matter. I use the heaviest split rings I can find. The cable type with the screw together barrel clasp may be stronger, but I have no extensive experience with them.