For a single day, and a somewhat price-conscious skier, I think that Bromley would be just fine. Their new high-speed squad has really transformed the skiing experience there. And if that lift gets too crowded, the fixed-grip quad on the side of the mountain provides reasonably quick access to the upper trails.
In early December at a race clinic I finally got the chance to ride Stratton's Ursa express, which is a much-welcome addition. But besides that lift, the only high-speed options are the six-pack on the small, flat lower mountain, and the rather unpleasant standing-room-only gondola -- everything else is a slow fixed-grip lift, which does not seem justified given the high prices Stratton charges.
Now of course, Stratton has much more terrain, but for a single day Bromley would probably suffice.