The motors in all the cars are very similar the things that differ are gearing in the trannys and programming in how the car shift but the 3.8 is a3.8 until it gets a supercharger on it or someone modifies it. Not alotta difference. I have always been partial to the pontiac line but im also pretty young i guess so the Buick just doesnt appeal to me, its styling is a little aged. If I wanted a luxury car it would be a cadilacc or a german car bimmer benz audi.