Training Judo at the same time will not hurt either one. You will just get a different perspective towards some of the same stuff. Many of the top BJJ BB are all Judo BB.
Quick question: Is there any particular time when training BJJ when it is good to start crosstraining in Judo? I don't want to get "my wires crossed".
So far my learning curve on BJJ has been rather slow (been at it for year and a half) and I don't want to mess my learning.
Sorry for putting it here. I just didn't think the question deserved a thread and could not PM you.