Best would be outside of the all in one coolers completely. Called open-loop or custom loop. All in ones are also known as closed loop coolers. Start up investment for a CPU block, pump, radiator, tubing, and reservoir will run you about $200.
Amongst the closed loop coolers H110 and others in the 280mm class are the 'best' but you also need a case that can accept them.
Best air cooler, and it can perform better then an h100i or x61, would be the Noctua NH-D14 or NH-D15. Or a Phanteks PT-TC14PE as an alternative (available in several colors)