This bike, a Pacific Reach City, is my daily transportation and takes me everywhere. It usually sports a set of Ortlieb panniers on the rack, stuffed full of all sorts of cargo, plus a veritable forest of lights. The small wheels are very handy for taking it onto trains, and the suspension is great for rough streets. I love it for its practicality and its uniqueness!
This one, a Specialized Myka Expert (which, in spite of the name, is pretty much an entry-level bike) is more for fun. I was 55 the first time I rode a mountain bike, and will never be skilled enough to do anything challenging with it, but it was just so much fun to ride that I couldn't resist getting one. I also use it for transportation when it's raining, since the disc brakes work much better in the wet than the rim brakes on my Reach.