Both! You can change watch faces in a matter of seconds 😎
I switch watch faces depending on my needs. If I'm at work I am more likely to use a high-information face with multiple complications like Modular, Utility, Simple or Color. I usually go with Modular because I attend a lot of meetings and it's nice to have Fantastical showing me when and where my next meeting is in the large complication. In Utility the complication is a single line, so it truncates my meeting info.
At home, or a day at the office when I don't have many meetings, I tend to use a less busy watch face. Maybe even a fun one like Motion, Photo Album or Astronomy. I like the visual of Solar as well. If I'm outdoors in bright sun, I might switch to X-LARGE because it's easy to read.
I used to have a preference for the analog faces, but after some time I decided that Modular is my most useful watch face at the office. I think it looks quite nice, and I like to alternate between various solid colors as well as the multi-color on occasion. I still like the aesthetic of an analog face. There is something about the circular representation of time... in a glance my brain understand where I am in the hour. Not that my brain can't translate simple numbers to how much time I have until the next thing... but there is something about a classic clock-face (even as a digital representation). But sometimes you need information, and Modular excels at providing it. Everything is nice, big and easy to read on Modular, and you can see more detail in that big complication. It's a nicely balanced layout as well. I think Modular is quite elegant, but all of the face options are in their own way.
Sean