Would you jump to Nikon if...

You were in my position? 

I used to have a canon crop body and sold it with its lenses in order to go full frame. I am inclined to buy a 6d but d750 looks sooo seductive 

Now I got nothing but a nifty fifty, so I'm not invested in any system at all. If I decide to go for D750, I will have to pay $400-$450 more.

Actually I like 6d a lot but when Im thinking of its limited AF system i am getting confused. Besides D750 has the edge in DR. I'm not gonna shoot birds or other fast moving things every day but it would be nice to know that my gear can handle it when I need it.

The only thing that 6d is better than D750 is the wi-fi app which I think I'm going to use a lot. I know D750 has wi-fi too but it's not as good as Canon's AFAIK.

So, in this situation, what would you do if you were me? Every helpful post will be very much appreciated.

Cheers,