From all I've read, wild Texas rat snakes are some of the nastiest around.
I do have to say though, I have an adult male captive bred normal Texas rat snake and he is my favorite out of all 30 of our collection. He is the most docile snake I have, never bites and you almost have to hand feed him his F/T rats. I take him to all of the school shows we do because I trust him completely with anyone. He's also rather striking at over 5ft.
They will you eat you out of the house though!