Personally? I hate all the bike music, as well as trying to maneuver around things. Like doors. The bike in BW is my least favorite, and the Acro bike is the coolest. (I like bouncing and popping wheelies, partly because I can't ride a bike in real life.) The BW bike is too fast, and I only really use it when I'm crossing Skyarrow bridge. I tend to forget to get off of it, and wind up slamming into walls when I'm trying to get into a building.
I prefer using my Running Shoes everywhere, even when it increases an already-high encounter rate. (I don't run on Route 7, though. The encounter rate is too high already.) I have my running shoes set to 'always' in HG, so I don't wear out my B button quite AS much.
So, yeah, Running all the way.