I love all of them equally. At first I can say it was Michael as my percentage was 45-32-23~ (M-F-T).
But on my second save i realize i wasn't playing it right and didn't let much attention to Trevor and Franklin, And I discovered their beautiful sides. I mean everyone have pros and cons so i finished the game 33-33-33 and I really feel at least for me there is no a loved one. They're all good!