If you are like most people, commuting implies getting to work on time and in the back of your mind is a comparison of total commute time and expense with the alternative of auto or mass transit. Consequently, bike commuters tend to be "head down, balls out" riders who aren't interested in messing around and just want to get where they are headed in the morning. In the evening, they look forward to the ride home and it often becomes a time trial with a shower and a beer waiting at the other end.
I commuted about 14 miles each way for 30 years between Davis and Sacramento and I would never attempt to do it on a bicycle with an upright riding position. Most of the riding is on open two-lane country road. Also, headed west in the afternoon during warmer months it is common to get 20mph headwinds! Those headwinds will make a grown man cry for his mommy. Under those conditions a traditional road bike with drop bars (to lower your wind profile) and close fitting clothing to reduce wind drag and a triple chain wheel in front is all highly desirable. Spend as much as you can afford. After all, you're not driving or paying for the bus or train.
At the same time, I frequently ride across town, about five miles each way for a doctor or dentist appointment on my 1980's converted TREK touring frame with one-speed, upright bars, a fairly wide Brooks B-67s saddle with built in frame lock, front basket, rear rack and folding baskets, 700x25 tires...my lightweight Dutch style bike, wind or no wind. Why? Because it's fun. One tends to be less goal-oriented and more engaged with the scenery riding in an upright position. Riding time is increased about 10% but the tradeoff of having to start a little earlier is worth it to me. I have ridden this bike with the aforementioned headwinds and it took longer. So what?
If your objectives are to minimize your biking commute time, get the road bike with drop bars with lots of gears for hills or headwinds and the best lightweight components. If you're willing or able to sacrifice 10% more time to live in the moment a little more, go with the lightweight Dutch bike concept.
Or, better yet, employ the fleet system of bikes like I do so you can switch depending on how you feel that day.