On Catch and leg locks: I’m sure that there are BJJ schools that teach them, we just don’t have them here. Around here, most Jiu Jitsu schools will not even discuss leg locks until you reach purple belt. Catch school, as I understand it, allow leg locks from day one. The result of this is that a BJJer has no experience at all with anyone trying to attack his legs until he gets to purple, and since he hasn’t done any leg locks earlier, his leg attacking game will be weak compared to his armlocks and chokes.
I can back this up with an experience I had in a no gi tournament that allowed leg locks. Twice guys from BJJ schools went for ankle locks on me, which resulted in a faint squeeze on my calf and an evil smile on my face as I spun into a top positon and started looking for submissions of my own.
Then I got ankle locked by a catch guy in the finals. Unlike the vaguely discomforting squeeze of a BJJ footlock, this felt like everything south of my knee was about to be ripped off in Italian zombie movie fashion, and I tapped out with both hands at once. So based solely on my experience, catch has better leg locks than jiu jitsu.