Where, in Turkey? RJ got punked against Arkansas because he had to play against of team of guys who are as athletic as he is. What do you think will happen in the NBA, or even the G League? He isn't going to out-athlete a lot of guys there.Then my guess would be pro.
For RJ to go to the next level he has to learn how to play organized basketball. He has to develop vastly improved judgment about when to pass the basketball, he needs to work on his defensive fundamentals, and he needs to develop a step-back, jab-step or some other move to get his shot off from 3-point land against a defender.
Right now he isn't close on any of those things.
Definitely a reasonable question whether he is better off working on them in college under Pitino or someplace overseas. He will certainly get paid a lot more to do it in college and will probably get better coaching, IMO.