I'm just answering with who has been less educated, which is decidedly different than how much of a dumbass they are. A position Trump holds a massive lead on compared to any other president in history (quite possibly any "leader" in history)
And oddly HW Bush was the most qualified candidate to hold the office as an ex-VPOTUS, chair of the RNC, UN Ambassador, CIA chief, Congressmen, and an ex-war hero. Even more oddly was that despite these qualifications he was merely okay at being POTUS