The only way to answer this for me would be to imagine which career I would have rather had had I been a footballer. On the premise of that, I would choose Wayne.
1) He won the champions league. Any player in European football, far more for the top top players would want a CL medal more than any others.
2) Rooney will be remembered in history as United's top scorer. Despite all out feelings towards him during his abysmal last few years, in addition to his contract antics, he is a United legend. It's really hard to say Ibra would be remembered as a legend at any club he played at except PSG. He will be remembered as a monumentally gifted footballer, but I don't think he ever hit the heights that would make a footballer go down in the club's history at any of the other clubs. He will more be remembered as a legend of the game overall than at inter, ac, juve or barca.
That being said, there is a part of me that would have loved to have a career that took you to so many different countries, getting to experience the different cultures, and so many different clubs, and winning things at all of them. I mean getting to play at clubs in Italy, Spain, France and England really sounds like the journey of a lifetime as well. It really is a tough one to decide.
Yes I contradicted my own post at the end there