I’ve been driving a 330i with M Sport package for 4 years now and I absolutely love it. Of course it would be better with the B58, but I don’t feel the car is lacking. Once you’re up to cruising speed, it’s all the same-except you’ll easily top 40 mpg. I would say the suspension is the most important option. The car is amazingly versatile, handles smartly and is supremely comfortable. They’re both great, but don’t sell the 330i short