I like the 5 Star theatre in Magna.
They don't sell advance tickets, so you can come the same day and usually gt in to shows that are sold out elsewhere in the valley.
And, because it's not far from SR 201, it's a quick drive to get there. You take SR 201 to the 8400 West exit, then go South to 3500 South and it's right there.
It's very convenient. Only 15-20 minutes from downtown SLC!
So it's close, convenient, and a nice theater!
I highly recommend it!
Pros: not crowded, prices are reasonable, lots of free parking