Online - If you only want to try one stick of a certain line it will cost as much as a B&M after shipping so it doesn't make sense and you end up buying a 5'er and risking not liking them.

B&M - I'm a younger guy and I always get the "who the F&%$ are you and why are you here?" look when I walk into certain B&M's or they just don't greet me or talk to me.