Which vehicle is better? A 2008 BMW 328i or a 2008 Mercedes C300?

Hey guys, so I'm in the market for a compact luxury sports car. So far I have narrowed it down to both the BMW 3 series and the Mercedes C-class. Initially my favorite car was actually the 2009-2011 Infiniti G37 sedan but my mom beat me to it, so buying another one would just look weird. I love the styling in the BMW as well as its over all driving dynamics however the Mercedes C300 sport feels more refined and for the most part Ive heard a lot more reliable then a BMW. Any suggestions?? By the way the Audi A4 is nice but I dont like the previous generation A4, the new A4 is still priced a bit steep even when used. So BMW or Mercedes?