Compare the BMW 3 Series 340i Touring F31 LCI - [2015] vs BMW Z4 35i sDrive 2d - [2009]. Find out which car is the fastest, most powerful, lightest or has the biggest engine in our top trumps style comparison page. Find out which car has the highest top speed or is the fastest accelerating, is it the BMW 3 Series 340i Touring F31 LCI or the BMW Z4 35i sDrive 2d. We'll leave it up to you to decide which is your favourite.