Hi
On the two 2.2 Z3’s I have had, they were fitted with 17” staggered wheels and on the two 2.0 Z3’s I have also owned they were fitted with 16” wheels
In my opinion the 16” make for a more comfortable ride and the 17” look better.
But just a matter of choice.
If my 2.0’s were fitted with 17” wheels I would not change them to 16”s
Norm