I've always found bullies get overly bonded Bird, so people orientated and loyal. I know these are the worst crosses for the lurcher rescues, as they get terrible separation anxiety.
Edited to add...... I think some of the line bred bull/greys are different. I have seen different 'personalities' in the line bred
100% agree with that moll
some dont like been fussed either, but cant be away from you at the same time