If I know what I want, I'd get it from EF. If I just want to check stuff out, I'll go to a b&m store so I can see it, touch it, smell it, etc.
I also LOVE to educate the people working at the store. I try not to be an ass about it, but some of these people are almost dangerously clueless (except one store in Ann Arbor).
Another difference I've noticed is that you will almost NEVER see the store owner in the b&m stores (except the one). That really makes me feel like they're just in it for the money, in all the worst ways.