217 all the way! I own both brushes, but I get more use out of my 217 as it's much more versatile. It's lovely for an allover wash for both cream and powder shadows, good for blending, good for soft creases, good for concealer. Really, I think the list of what it's not good for is shorter than what you can use it for. It's fabulous! I want a second one!
If I ever had to pair down my brush collection to include only a few eye brushes, my 217 would make the cut, but my 222 would not. The 222 is a good crease brush, but it just can't compare to usefulness of the 217.