Define best? Cheapest? Just depends on the time. We bought our last Audi from Sewell sugar land and overall good experience.
Not so good were "Sewell for life" customers like their commercials. We'll still shop around when that time comes.
But there were some issues beyond their control. For example, my wife's car was on the carrier ship that was abandoned at sea because of a fire and they did everything they could to get us a car as quickly as possible.