Hit parade

The most interesting US Presidents are Washington, Jefferson, Jackson, Lincoln, possibly Nixon and certainly Trump. Kennedy for glamour and sex life.

The most important are Washington, Jefferson, Lincoln, FDR, Truman, LBJ and possibly Trump. 

The worst are Lincoln without a doubt, LBJ, Bush 2 and Biden.

The most interesting English PMs are the Pitts, Wellington (though not for his premiership/s) Disraeli, Lloyd George and Churchill. Canning was very interesting, a great man but as Foreign Secretary. He was PM for the shortest time of any.

The incompetent ones were Theresa May followed by Boris Johnson, 'Liz' Truss, Macdonald perhaps (he looked up railway timetables for his secretary) and Balfour (as PM, before his Declaration).

The worst was Blair because of immigration and devolution and other things like an unjust illegal war.

Heath changed UK forever by joining the EEC but had it not been him it would have been Wilson or somebody else. It was wanted by Washington and eventually permitted by Paris.