In Budget speak, a Standard SUV is a 5-seater (think Edge, Blazer, Sorento, Grand Cherokee) and an Elite Standard is a 7-passenger (Acadia, Traverse, Explorer, Atlas). Renting a Standard could get you a larger, if they have or upgrade, but reserving an Elite will get you one or upgraded to bigger/similar for passenger space.
Most SUVs in SLC during the winter will be AWD.