I think the difference is Mike loved his dad but never felt any pressure to "one up" hime and Ron Jr. always seemed to feel he was in competition with his dad when he was in office. I mean, Ron Jr. was ALWAYS doing whatever he could to embarrass his dad. I wonder if his rage at Bush isn't simple jealousy: here's a President's kid who has done better than his father. I honestly think that's why Ron hates Bush so much. But Mike just is who he is, and seems very happy and at peace with that -- and as a result is successful, he doesn't have anything to prove.
Just promoting the use of "R. Prescott Reagan"
since he's not a Jr.