About one out of every five hunts will produce a fox squirrel or two. Also depends on the type of habitat where I am hunting, because fox squirrels are more inclined to be on the edge of a field/opening or road.
Same as everyone else - here in eastern Arkansas it's mostly Grey's with an occasional fox. Probably 10 to 1 but it depends on where you hunt. My northern property boundary is the St Francis River. (I live near Widener.) There it's almost all fox squirrels.