Screwgates every time , leave it fully undone till you need to screw it up, never had a problem with them in the 40yrs I've been SRTing and always like the additional security when I need it. In addition all krabs in use on your harness should be able to be used for everything that you need to do, i.e. no semi retired krabs used "only " for hauling etc, if you dont trust them bin them. And RJV is correct technique is everything , approach rebelays etc slowly , think about it, orient yourself and be deliberate then you wont get crossed up etc.
I wont use wire gates ever underground and if your a climber you should look at some of the videos of wiregates with rope running through them on a fall!!! the gates vibrate with an amplitude of open to closed ? and you can bend the wire with your fingers? nough said.