For me it is the guillotine. There's this am. fighter in my gym who was a college wrestler and he has the insane wrestler strength and no matter what position you're in if he gets his arms around your neck you're getting choked lol. I don't really get caught in anything else except for the guillotine and the occasional leg lock. The submission I get the most is the triangle. I'm not very tall, but I catch people off guard a lot. What do you get caught in the most and what do you catch people with the most?