I’m having a rifle done and chose to go with Cerakote. I don’t know what the technical difference is between the two but from everything I’ve read and heard Cerakote is probably a little tougher. Another thing I liked about Nic Industries is they will send you samples on little metal plates so you can make a more precise choice as to color.
I read up on it quite a bit and the Durakoat seems to have great reviews if you are looking for a DIY project. The Cerakot seems to be better more durable but requires you to send it out and have it profesionaly done.