Garmin Venu 3 vs. Venu Sq 2 Music: Which is the best 'mainstream' Garmin watch?

The Garmin Venu 3 is our favorite fitness smartwatch, while the Venu Sq 2 is a compromise pick that costs much less. They're both relatively mainstream compared to most rugged (aka ugly) Garmin watches, so you'll want to start with one of these. But which?