The horsepower of the MG ZT is by 19 horsepowers grater in relation to the Audi A4 B6 Sedan. As the difference is small it should not affect the car performance to a large extent.
MG ZT Estate 1.8 120HP has 85 mm longer wheelbase in comparison to the Audi A4 B6. A longer wheelbase gives more stable and comfortable ride, especially when driving fast. It also gives more storage space. However, vehicles having a longer wheelbase will not be as maneuverable as those with a shorter length between its axles.
The MG is 204 mm longer in relation to the Audi A4 B6 Sedan. The length of the car plays a role in respect of travelling comfort and room in the boot. The MG ZT Estate very likely will be offering to it's passangers more room for legs. Aditionally the MG will be better driven ,however, the Audi A4 B6 Sedan will be a little easier for parking due to shorter length .
Number of doors
A five-door car generally means a hatchback (however estate cars also count as 5-door cars) and because of that the MG, where you can open up the boot lid and fold flat the back seats making more room, has the edge on the four-door Audi which in turn has a smaller trunk cut off from the passenger compartment.
Model release date
The difference in release date between compared cars is only 1 year, however, new technologies for automotive industry are appearing at a fast pace and for that reason the MG may have more modern technologies.
If you are a tall driver or you carry in the trunk thinks of big dimensions, the MG ZT, which is by 51 millimeters higher than the Audi A4 B6, would be better pick for you. However, presented vehicles do not differ much when it comes to its height and it should not be much observable.