I have three different bikes that I commute on, plus another two that I previously rode before selling or decommissioning. Two of my bikes are sport touring frames with fenders, mounts for a large seatbag and geometries that make them ideal for commuting. However, I also enjoy riding my classic De Bernardi Italian racing bike on days when the weather is nice and I don't have to carry much gear. Before I sold it last summer, I often commuting on my Merckx Corsa during the warmer months. The racing bikes are faster, lighter and more fun to ride but not ideal for carrying loads and lack clearance for larger tires and fenders. Variety is the spice of life.