Question: why bjj is better than judo?
Answer: Judo is better for stand up grappling. BJJ is better for ground grappling. ... Some BJJ gyms are run by guys who are also Judo black belts... and they often will incorporate a decent amount of Judo technique into BJJ. Personally I prefer to use Judo (or standing grappling) in the few situations I've had to defend myself.