As a kid i listened actively to both.
Nowadays its only Prince for me. I wont skip a song with MJ if it gives me that nostalgia value,like some weeks ago i heard Leave Me Alone again for the first time in years.
Both flirted with rock music as well,although i feel like Prince showed time and time again,he could rock out just like the best rock guitarists out there.
One was a "hitmachine",the other one was a musical genius and did absolutely everything himself.
I stayed with the genius. The best one to have done it!
(I chose to strongly believe that both was taken out,wich upsets me even more....... they dared to speak out against the industry and the elites there)