I've been involved in Judo for over 45 years and in BJJ for over 30. When I start cross training in BJJ, I was a judo BB and I used to train Judo in the best academies in Brazil. (Judo was and still bigger than BJJ in Brazil) Anyways, I was getting caught in submissions by BJJ blue belts, that's when I decided to figure out the Jiu-Jitsu ground. I would say that a Judo BB is equivalent a BJJ Blue belt for the most part. I use my Judo in BJJ competitions and my BJJ in Judo competitions and so all my students since my schools teach and participate on both. I believe Judo is more suitable for BJJ than wrestling (with gi) as long as the Judo school/instructor don't limited themselves to the IJF rules and have some understanding of Jiu-Jitsu because not everything Judo will work for BJJ, a lot of the things have to be adapted. By my experience, Judo BB can and will pin you, they have very strong grips and they will try to submit you with the "Ezekiel" from your closed guard. They usually are faster learners in BJJ. BJJ guys are slower learners in Judo.