So what is the night skiing at Brighton like? Is it worth bothering? I can see taking a dinner break and then going back out. But that would argue for lugging my own skis, since returning demos would be a problem (no time the next morning).
Bottom line, and I'm sure UT locals have a better take on it - I'd go to Snowbasin in the first place, and just max out the day there. Solitude lifts are slow and layout complex -- not bad, just complex. Snowbasin lifts are FAST and layout is simple -- a big basin, all lifts except Strawberry feed back into the main lodge, and Strawberry access is straightforward (and well worth it). You can rent at the hill and return there. Long days now in March so maybe even they stay open a little longer? I'd bet you can get more vert in 8 at Snowbasin than 12 hours at Soli/Brighton. (And FWIW the food at Snowbasin is just outstanding.) Even if Snowbasin is "crowded" it is not crowded by eastern standards and it's only on the gondola - as someone mentioned above, the John Paul express lift is 50 feet away and goes to better terrain anyway, or get yourself over to Strawberry.