I have played at all major fields in Oklahoma and none compare. The playing surfaces are even and there might as well not be refs cause they don't check chrono speeds or anything.
Paintball Club of Choctaw is by far the best field in Oklahoma. There are plenty of fields that are all diverse and the refs are very helpful. The playing fields for the tournament level paintballers are perfectly flat and the grass is nice so you can slide a long ways. With plenty of staging areas and self-serve compressed air stations it is the closest to a real tournament place you can get. Its also great for some relaxing rec ball.