First of all, this is totally a personal preference, but my preference is the coupe. The coupe looks sporty vs sedan. Also, I hear comments about many people not considering the 3 series to be a luxury sedan (too small, entry level is near luxury). The coupe looks more impressive and less entry level.
Very nice video that contains Ford Focus ST and Opel Astra OPC.
The Audi A5 is better looking and slightly more luxurious. The BMW on the other hand is sportier and more fun when you stomp on the gas pedal and listen to the engine go to it's redline.
Bugatti Veyron Vs. Mclaren F1.
Fifth Gear comparasions Audi A5 and BMW 335i.
Drag race of Opel Astra OPC and Ford Focus ST.
Car comparasion between Renault Sport Clio 200 Cup and Ford Focus RS.
Audi R8 vs. Audi RS4 vs. BMW M6 vs. Porsche Carrera S
Audi RS4 Vs. Porsche Turbo.
Comparison of three BMW's, M3, 135i and 335i.