First a little background here, I've done Karate for 7 years and quit some years back because of reasons I won't discuss here.
In either case I have all this experience build up and recently met someone who is good at aikido. It seems they have really good techniques for locking up your body in all sorts of awkward positions without almost no effort using joints pressure points. This can be really good techniques to use in harmless defense - which in karate is almost non existent.
Jiu-jitsu also seems to have really good techniques to lock other people but they seem less refined imo, they do have a much better ground game.
So I'm searching for a discipline to replace Karate with but am wondering what the best addition to Karate skills would be.