I like how PFL is handling business, they give more freedom and tournaments competition is great.
Contracts in UFC can also be flexible but only for Conor McGregor, for everyone ekes it is restricted area   
Anthony Pettis didnt have the very good results in PFL, since he came from UFC he lost four fights and won only one in PFL, so he had to try something different.
His younger brother Segio Pettis is doing much better in Bellator, after moving away from UFC he made four wins and his next fight should be against Patricio Pitbull.