My curs have been in tight quarters with numerous dogs of my hunting buddies and never thought twice about it. Been a little growlly a couple times but have never had to pull over for a dog fight between curs. I would never even attempt that with a bulldog. I havnt been at this for too long but if I could find a dog that caught as good as a pit, so that I wouldn't have to own one I would. They are a tool to me. I am not a bulldog lover at all. So my opinion of a bulldog being more aggressive than a cur is pretty biased. Ok, now I'm ready for the stones to be thrown.
As a bulldog lover I would not throw any stones your way. That is your honest assessment, and I would rather someone responsible have one and respect their potential good or bad than someone who treats them like a regular dog and comes home to a accident or worse. JMHO