We went with Coach USA and I think last year we used Starline, both companies were ok and price wise around the same price.
When we went with Starline last year we were picked up at our hotel and it was a small bus ( we call it a minibus) but when we got there, it was just us 2 that got off as the others were on an LA tour so when the bus came to pick us up again, we had a bus all to ourselves!!!
Love Ella