I think the "sports" class of bikes make for great commuters. Sort of midway between racing and touring bikes. They usually have a bit more clearance than race bikes, eyelets for racks and fenders, and don't feel as sluggish as your typical touring bikes. Depending on your commute, quick handling is a plus, especially if your commute involves movement in traffic. Touring bikes with extra long wheelbases can be sluggish, whereas the "sports" category of bikes are a nice compromise with a more racier geometry in combination with reasonable chain stay length and tire clearances.

My Cilo Pacer makes for a nice commuter. It's equipped with mostly vintage Campagnolo NR parts, which some might consider too precious, but it's durable and reliable. It has eyelets for front/rear racks, 531 butted tubing for frame and forks, long but not overly-long chainstays, plenty of tire clearance. The main triangle angles are similar to my vintage race bikes, but the fork has a slightly more trail, and it's a bit longer in the rear triangle.

With 34mm tubulars:


On the slog: