What are the differences between the Audi A4 B8 vs B9?

I am considering purchasing a used Audi A4, but I'm not sure which generation to go for. Can someone explain the major differences between the B8 and B9 models, in terms of performance, technology, and overall driving experience?

The Audi A4 B8 has a turbocharged 4-cylinder engine, while the B9 has a more powerful supercharged 4-cylinder engine. This results in a noticeable improvement in acceleration and overall performance.

The B8 model has a more traditional, button-heavy dashboard layout, while the B9 has a sleek, modern design with a large touchscreen display. This makes it easier to access and control various features while driving.