Screw It!
Pros
Compact
Round stock all the way around allows it to run smoothly in guide mode even if it spins around to the point where the rope is running along the spine
Lightweight for what it is
Cons
Takes about twice as many rotations of the screw (about 13 half rotations) to lock it as a normal screw-gate carabiner
Familiarity
I’ve used it a bunch