I don't trust the 7-speed dry clutch DSG, but the 6-speed wet clutch maintenance box with the bigger engines is much more robust and reliable. Needs fresh fluid and microfilter every three years.

No emissions problem with the EA288 petrol and diesel engines and in fact the EA288 is one of the lowest NOx 2.0 litre diesel engines. It was the old EA189 that had the problem. So a Superb 2. 0TDI 150 DSG will probably be okay. A Mazda 6 has a much better 6 speed transmission and better steering and handling, but is smaller inside. An Avensis is best bought as a 1.8i Valvematic Multidrive S CVT auto. A Mondeo has a Powershift, like the DSG, but not prone to hesitation on start-up.