e90 330i is the pick of the range in my opinion.
Beautifully smooth refined engine, gorgeous induction noise and an engaging drive.
There is plenty of power, but the car responds very linearly and rewards enthusiastic driving. The engine loves to be revved and performance is perfectly balanced with the ability of the chassis.
The power delivery in the 335i makes it less fun to drive in some ways. The higher torque makes it necessary to chase the redline and the extra performance just means that you run out of road sooner.
When you test drive, try to get a full bore run through the gears hitting the redline in 1st, 2nd (3rd if you have the room). Great fun
I quite miss mine