I usually run as wide of a tire as I can reasonably fit on the wheels and in the frame. This is really more of a user preference than anything else. Modern testing has found there to be a much smaller disparity in "speed" between different tire widths than we used to believe there to be. And, in fact, a wider tire may be a more appropriate choice than a narrower tire depending on riding style, riding surface, etc. It seems that the narrow and super high pressure is demonstrated to have its advantages on very smooth and consistent pavement...and wider and softer tires become more optimal as the surface becomes more irregular. And "more optional" isn't just from a comfort perspective. The bicycle "system" loses energy when a tire has to bounce over a small stone or irregularity; the system can lose less energy if a tire can efficiently deform over that obstacle and keep the bike moving forward with less disruption.

All that said, I really do like the wider tires for their comfort. I'm not a competitive cyclist. I'm not out for PRs or KOMs or anything like that. I do it for the enjoyment and the difference between 30 psi and 60 psi makes much more of an impact (pardon the pun) on my comfort (in a positive way) than it takes away in efficiency or watts consumed.