Yeah I test drove both of them this past month. I really enjoyed them both. The BMW is for sure more sporty and faster. The S4 though, just feels way more premium in the interior, and I like the styling of the black optics slightly more than the shadow line package of the BMW. Also the upgraded sound system in the Audi I hear is better. To get the upgraded HK sound, you need an additional premium package with a bunch of stuff I don’t care for.
In reality I would be happy with both. This would be my first luxury sports sedan. I will wait a bit to see if I can land a S4 if not, I’ll get a m340. There seems to be plenty available. Also if I wait long enough, I could be in the market for the new designed S3 or an STI.