Not an area I have hunted in a long time but as a freelancer if a guy is flexible about where and what types of cover he will hunt, will invest in some scouting and can figure out how to take advantage of the golden hour a good trip can be had most anywhere in the SD pheasant range. The caveat there could be avoiding areas with lingering effects from the 2017 drought....
Doesn't always work out for me but I will usually choose an area with more public land options and less birds over one with more birds and limited public access.
If you are fortunate enough to be hunting a good sized chunk of private land with good cover then I'd like your odds....