I love both ways, depending on my mood, and the length of the ride. As a consultant, I'm at a different place most days. The last 3 days, I've been at a place in Central London that gives me only 1.5 miles ride to the station, and I've been on my fast single speed roadie. I have absolutely sprinted the whole way, taken every other rider on the road as a challenge (and passed pretty much every one), and arrived at the station feeling sweaty and exhilarated! I have clients who are 10 miles from the station though, and I often take that at a more relaxed pace (there are far fewer other commuters, which is a thing that makes me ride faster, for a start!). I set my PB for that ride with a badly dragging fender, because my train was late, and I hammered all the way just to get in on time. I got in looking and smelling like a weasel who's been chased by a pack of dogs, and had only 5 mins to make myself presentable, but I felt good! (and shaky!)