Cruise Control. I find I'm using it more with the X but boy is it fiddly. The F10 is all controlled via the multifunction steering wheel and very easy/intuitive.
Main beam Assist. On the F10 it's a button on the left stalk. Push once to activate, push again to disable...simples. With the X I find it strange that to turn it off you in essence have to flash the main beam.
The black instrument panel of the F10 was very nice and had a wealth of info if you so desired.
I know that the F10 came into production two years after the X6 and congratulate BMW for always pushing forward with useful technology, and know the next incarnation of X5/6 will have these features and more.
Larger sat nav screen on the F10 was nice but soon got used to the Xs, although I must need an update sat nav disc as I'm not getting full colour or all the functions I had on he F10
With the F10 it has keyless start stop, but comfort access is an option, and one that I felt should have either been standard or encouraged by the dealers as it sort of spoils the point of keyless start stop if you still have to fish out the key to open the car, so having it with the X is wonderful.
Comfort seats, yes they certainly are! I could sit in these all day long and then some. Just have to make sure the misses always uses her key and doesn't start adjusting my perfect seating position.
I've already waxed lyrical about he HUD and rightly so, oh so very very useful. Even the wife, who's a bit of a techno phoebe likes it.
So ask me where I'd rather be....X6 or F10.......you the answer to that.

Don ( still in the sweet shop)