Dont just talk to the outfitter, ask him for at least 5 references of hunters who had success and ask for another 5 references of hunters who did not have success.
You didnt tell us, What weapon or season are you wanting to hunt? I sure wouldnt limit myself to just TX or OK.
I think you need to decide which species you want, CO, KS, NE, SD, as well as other states have Mule deer, some with over the counter tags, some areas are a draw.
Good Luck