95% of the time, I use Utility. I get three complications (one for Dark Sky, one for Fantastical, and one for Alarm) plus analog hands which, for me, are quicker/easier to read than a digital display. Somehow my brain has a slightly easier time processing things like "I have 20 min left before the meeting starts" when looking at analog hands vs. a digital readout.
On the weekends or when I don't have a lot going on, I sometimes switch to Solar (my second favorite), Photo (I made some cool Live Photos of my daughter, one of her delivering a Tae Kwon Do kick), and Motion. When I'm on one of those faces, I rely on Glances to take the place of complications. I've reduced my number of glances to just the absolutely essential ones.