OK, more trail discussion: What trails are often (always) the first where you ski often to open without any snowmaking. Exposure (sun and wind) and elevation usually play the biggest role.
I'll start with:
Sugarbush: Spillsville. Up high, sheltered from wind. Not much in the way of (any?) waterbars that need to fill in. Little (if any) blowover from snowmaking trails on either side, so that is not a disqualifying factor.
Close second is Domino.