Safety: The BMW 3-Series is safer; it's been rated five stars overall by the National Highway Traffic Safety Administration (NHTSA) and the A4 has been rated “poor” in frontal collisions while the 3 series was rated “Marginal”.
Luxury: They both are equivalent in this category.
Speed/Power: Both cars are powerful but the BMW is more powerful.
Price: You can save $1,850 by choosing a BMW 320i rather than an Audi A4. Of course, the 320i is not as powerful, which means you might prefer the 328i, which costs $2,800 more than the Audi. Audi buyers to pay less than the invoice cost for a new A4 while 3 Series buyers are likely to pay more than invoice, and the Audi starts to look like a pretty good deal. However the BMW keeps its original value for longer and costs less to maintain so overall the BMW wins in this category.
Reliability: Take a look at reliability data sourced from Consumer Reports and J.D. Power, and it's clear that the 2014 Audi A4 is expected to be more reliable than the 2014 BMW 3 Series. Each market research firm rates the Audi better than average in terms of quality and reliability, while the BMW earns average ratings from these two companies. As a result, Audi takes the victory in this area.
Practicality: The BMW is not as comfortable and does not drive well in bad weather as it is rear wheel drive. The Audi is not fun to drive but is better in bad weather as it is 4 wheel drive.
Economy: The BMW is more economical and has more power which means BMW sure did something right.
Ride and Handling: The BMW wins by a LOT!
Technology: They both are equivalent but the BMW has a slight edge.
Emission: BMW releases less harmful gasses by 1 g/km
Looks (Inside and outside): The BMW is much better looking on the inside and it is also better looking on the outside.
Can the A4 Beat the 328i?
Audi's Quattro adds the benefit of grip, but without it the A4 is a front-driver that can't handle as well as a rear-wheel drive BMW. The BMW also gets