For those without the deep pockets of the RS6, the Audi S4 Avant is only a mere 0.1 seconds slower than the S4 but has much more storage and practicality. Classified under "crossover," the Audi S4 Avant is no slouch and should be considered if you are a fan of sporty wagons all wrapped up in luxurious features and a reliable Quattro drivetrain.