Front PDC is available, though it is an option in the UK.
Really it comes down to what you want the car for and intend to do with it. As someone once posted... 5er = miles 3er = smiles.
But seriously, test drive them both and see how they work for you.
Gone: Fiesta - Focus - E46 320dSE - E91 330dMSport - E82 135iMSport - R55 JCW Clubman
Now: M135i with lots of toys