One thing I don't see mentioned (sorry if I missed it) is whether you plan to carry anything on the bike. If you commute to work you'll probably want a change of clothes and work-related items - tools, laptop, briefcase. If you plan to put a rack on the bike, rack bosses and eyelets will make the installation neater and more solid. Looks like the Vita gives you those. I'm not sure about the other choices.