328i = c300
To put things short, if you are a BMW guy you will like the 3 series more and vice-versa.
Buy a 328i for its performance. If you prefer a softer, more luxurious ride, go with the C300.
2007 E90 328i - Titanium Metallic l 19" VMR V710 l H&R Trak+ Spacers l M-Sport Rear Bumper l Mtech Rear Lip Spoiler l Hamann Front Lip l Eibach Sportline l AA N52 Signature Exhaust l OEM Blacklines l MTEC V3 AE l 6000K HID l Nokya 7000K Fogs l MTEC License Plate LED l Interior LED l 15% Tint l BlackVue DR380G-HD + PMP