Samehada KB. His jutsu and Grab both launch the opponent away. Even with him, you'll rarely get a ringout though. Daruis grab is pretty good for ringouts as well, but his jutsu doesn't knockback.
They should've made it so that you could turn ringouts on/off, but if they were on, a single hit to the edge would cause the barrier to shatter. As it stands, ringouts will pretty much rarely if ever occur, making them a pointless addition. They are disabled for ranked, so there's not an issue there. Ringouts looked better in their introduction video, when a single hit caused rails on the edge to break and there was no invisible barrier.