Excluding observation aircraft, such as the L2 Grasshopper, the easiest aircraft to fly were the biplanes such as the Gloster Gladiator,
The Fiat Cr 42.
The Polikarpov I153.
And some monoplane fighters such as the Zero.
The Macchi Mc 202 and 205.
And the Yak family, Yak 3–9.
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Most likely slowest fighters would be a biplane (triplanes were out of use after the WW I). top speed 285 km/h at ground level, 350 km/h at alt. It was used mostly during Soviet-Finnish war of 1939/1940, Finns managed to capture/restore several of them and still used them in 1941–1944.
For example, due to the sheer size, aircraft like the Airbus A380 and Boeing 747 are said to be two of the best planes for coping with turbulence. This is not to say that bigger planes are always better at dealing with turbulence, though.