E89 Z4 sDrive 35i vs F20 M135i

[va1o]

Slightly odd comparison perhaps but I've decided I'd like a recent-ish small 6-cylinder BMW as my next car, and have limited it down to these two. Practicality isn't really a concern so the 1er would be a 3-dr if I go that route. Would go for the Automatic 'box with whichever I pick. Otherwise not really fussed on spec as long as it has Nav.

I haven't driven either, how are they likely to compare on the road? On paper the Z4 looks more special and benefits from the DCT, but does the M135i's lighter weight make it more fun to drive

[va1o]

M235i is out of budget unfortunately, would be good fun though!