am widely known throughout my industry as the Audi Fanboy. My first car was an Audi A4 B5 1.8T. It's a 6 year old used car when I bought it in 2003. It was the first generation 1.8 Turbo, and it's the only car other than the Ferrari 355 to have 5 valves per cylinder and a rather advanced 5-speed ZF auto transmission at that time. That car was so successful it is still arguably the only Audi A4 with a cult following, it was also devastatingly quick in racing that it ruined the BTCC. The A4 B5 was the last racing car after the Audi IMSA GTO in US to have met with a similar fate of being banned for dominating a racing series. In short - quattro rules. Or to be precise, AWD rocks.
A few years later, I got myself an Audi S4 B8 Avant which I'm currently still driving. It is a very fast and very safe, all weather high performance monster. It's now making 520Nm without a squeak of wheel spin either. Rain or shine, my car drives with such a conviction that it lays its own imaginary bullet train tracks wherever it goes.
Thing is this, putting power down on all four wheels is always better than pulling or pushing with two wheels. The key is to decide when to send power to which wheel. With current technology, it's not impossible to decide when and how much power to be sent to each individual wheel in order to get the car around corners in the fastest possible manner.
This is why both Mercedes-AMG and BMW M has turned to All Wheel Drive recently, simply because it's just physics at work. Coupled with torque vectoring, quattro is then a magician at work, capable of sending power to the outer wheels to pivot the car into corners.