My favourite Watch face continues to be Explorer. It’s subtle, doesn’t offend too much uh in low-light situations, and lets me keep an eye on key complications (WaterMinder and Pedometer++).

An Apple Watch showing the Explorer face, with the upper-left complication showing water consumption and upper-right showing steps taken, both as progress bars. The bottom complication shows the day and date.
Angelo Stavrow @AngeloStavrow