I find it a lot more comfortable to ride on the road. I hate sidewalks in my area because they're not kept, they have seams every few feet, and your constantly riding up and down the bumps for parking lot entrances. The only "MUP" around here is are paved rail-to-trail paths. Most of them are hardly used but fairly new, so I take those when I can. If I had to choose though, I would take road all the way. Personally, it's safer to be in traffic where people are aware of your presence and actively working to safely (most of the time) pass you than trying to dodge people and obstructions on a path or sidewalk.