Bleecker Street has ample amount of longevity, whereas Purple Label - and I love it to death - quickly goes so close to the skin that you'll think about reapplying. Bleecker, doesn't smell as similar to Purple Label as people say, it meanders through the notes in a totally different manner than Purple Label - to me.
Mind you, my nose is about as amateurish as you can get though, to be honest.
But I did find them similar enough to not buy both. Went (and stuck with) Purple Label.