Honestly I think they would both be successful musicians, but nowhere near the level of success and quality. U2 is BY FAR MY FAVORITE band and IMO the greatest band in the world.. but I can't help but always think, Bono is not the best voice, Edge isn't the best guitarist, Larry not the best drummer, Adam.. might be the best bass... buy anyway... what I love about these guys, is the 4 of them make this band. I think I got off topic, but yeah, 4 of the best musicians of all time, not the greatest each, but combined, indisputably the greatest.