What are the main differences between the Audi 80 B4 and B3 models?

I am looking to buy a used Audi 80 and I am trying to determine which generation is better suited for my needs. Can someone please outline the major changes and improvements between the B4 and B3 models?

The B4 models were released in 1991 and featured a more aerodynamic body design as well as improved suspension and handling. The B3 models, on the other hand, had a less refined design and older technology, but were generally considered to be more reliable and easier to maintain.

While both the B3 and B4 models have similar engine options, the B4 models had improved fuel efficiency and power due to advanced engine management systems. If you are looking for a more powerful and efficient car, the B4 would be the better choice.