I used to commute 18.7 miles each way on a touring bike fully loaded with panniers. There is no way I would ever attempt that on a road bike. Now that I commute 30 miles one way, I drive in, bike home, then Tuesday bike in, drive home, then repeat Wednesday and Thursday. Friday is rest for Saturday club ride. Because of this arrangement, I can ride either my touring bike or my road bike, because I have no luggage - it all stays in my car.

As a result, I've done both. The road bike is really fun because it is so light and fast. However, with 28 cc tires and fenders, I'd much rather be on the touring bike in the rain. I am lucky in that I can choose the bike that fits the conditions. Most likely I will always drive in with the touring bike for the ride home.