Leglocks hierarchy

I do understand that every position has its strength and weaknesses. But theres also bjj positions or techniques that are better to put your time into. Some positions and technique just have a higher ceiling than other positions. Ofcourse, there are many factors that goes into why someone would choose a position or technique. And some would be better at others at different techniques and position. But i would just like to know how would you put the leglock hierarchy?