Oh boy. You'll probably get as many opinions as there are individuals, but my view is:
Okeetee: Same basic colours as a Normal, but with thicker, crisp black saddle outlines. Overall, slightly more vivid than a Normal or Miami.
Miami: Silver-grey or paler brown background colour with red-brown saddles. Overall, slightly less red than a Normal or Okeetee.
The trouble is that you often see Normals labelled as Okeetee or Miami because this inflates the price a little for the seller. A photo would be best when you can manage it.