Winter Tyres are now quite normal here in Holland; up until a few years ago it wasn't. I drove Audi Quattro's before and everybody made fun out of me that I was driving with winter tyres. Both Quattro or X-Drive are useless without winter tyres in slippery conditions.
I prefer X-drive more because it is much more RWD biased then the quattro. Off course that is a personal preference. That same preference made me install a Drexler LSD on my previous F10
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Current: MY18 G11 750i (daily), MY14 Porsche 991 S (x51, m/7) (fun), MY17 Mini Clubman JCW All4 (GF)
Retired: MY14 F10 535d, MY11 F11 530d (temp), MY10 F10 535i, MY87 BMW E30 325i (fun), MY74 BMW E3 2500 (fun) (and more..)