The only one I have been to is the Prairie Band Casino.  Very clean and on my first visit I got $50 free play for getting an Advantage Card.

I was a bit disappointed that it changed to PBC from Harrahs, but they've done a nice job with the transition.

Harrah's in KC is quite nice, as is Ameristar.  I liked the layouts of both casinos.

Golden Eagle - not impressed.  Granted, it has been about 5 years since I've been back, but it is definitely in need of an upgrade in decor, layout, and machines. 

If to choose, I would pick PBC if I were to stay in the Shawnee Co area. 

The Prairie Band Casino has a good special this month.  A coupon on their web site for a 1/2 price buffet.

Tried it yesterday - lunch buffet with coupon was $4.72.