If your goal is to increase your jump, then doing more jumping is going to help. This means different kinds of jumps, like seated jumps, depth jumps, bounding, hurdles, broad jumps.
But to do any of the more advanced plyometrics (depth jumps specifically) you need to have an adequate amount of strength. I think I read once that you shouldn't be doing any sort of depth jump unless you have at minimum a 2xbw back squat. If you dont have that prequisite strength then its best to get stronger, and to have the most amount of carry over from squat to jump, you should be using the same stance for both.
Some folks in here have made reasonable points for quarter squats and a few other excercises; but my opinion is the best carry over is going to be any explosive movement.... period. So that includes power cleans, other jumps, med ball throws etc. Practicing and engraining the movement pattern for creating massive amount of force rapidly while hitting good positions takes time.