On my 15 Ecoboost i went with 225/55-18 Dunlap Winter Maxx for my winter tires, see the Competition Orange Ecoboost below. These tires were studdable winter tires that had a very aggressive tread that were a beast in snow but they were noisy on pavement and the handling was a little mushy.
The 15 was totalled with the winter tires on the car so i wound up with a set of PP wheels in the garage. For my 17 i decided to use my extra set of PP wheels for my winter tires. I purchased a set of Yokohama Ice-Guard studless winter tires in the stock PP size of 255/40-19, see tire stack. These aren't as good in snow as the Dunlaps but are much better than an all season and are quiet and handle very well on pavement.
I am much happier with the Yokohamas because where i live south east of Boston the roads are only snow covered for a day or so after a storm and i have a beater 4x4 Pickup with the most aggresive winter tire you can get, Firestone Winterforce, for the bad days.
Dave