Since January last year (yes, 13 months), I've been comparing the 330i to 335i.
I test drove a 330i, and liked everything about it. The style, comfort and power. The sound of the straight 6 was lovely, as was the smooth gear box (coming from a 350z, nothing could be worse).
Then I test drove a 335i. As soon as I heard the car on tickover, I knew I wanted it.
The noise, the power, the twin exhaust, and the noise. The noise.
I bought a 335i on Friday.