Meh, since you ask, I like the maneuverability of a two wheeled bike. You can hop curbs, medians, cut between cars and zip along narrow sidewalks to get to work. Now I don't normally cut between cars or ride along sidewalks but I like the option of being able to move along using any means possible. Seems like a trike would slow me down.
On icy roads, I can just imagine that trike slidding sideways in the ice just as we used to do as kids and the trike would be tail heavy too. Just my two cents.
Ernest