Two Sedans with more similarities, such as the body structure, market segment, fuel economy, height, and maximum occupancy, than differences, like the starting price, horsepower, and ground shadow size. First of all, the 2016 Acura TLX is priced $9,405 lower compared to the base MSRP of the 2015 Audi S3. Also, the 2015 S3 has a more powerful engine than the 2016 TLX. And finally, the body structure of TLX is slightly larger than that of the S3. Among similarities are the body structure, market segment, fuel economy, height, and maximum occupancy.