Arctic Liquid Freezer II 280: offers more flexibility Vs the 420.
be quiet! Pure Loop 280: flexibility, and doesn't have the VRM fan, which adds another point of failure, as well as being a gimmick. No software required to operate.
Fractal Design Celsius+ S28 Dynamic X2: flexibility, no VRM fan, no software required. Want more RGB? Then check out the Prisma version instead.
NZXT Kraken X63: flexibility, no VRM fan, CAM software is required(experience may vary). Want something a little more flashy? Then check out the RGB version of the X63, or the Z63 instead.
Corsair H115i Elite Capellix: flexibility, no VRM fan, iCUE software required(experience may vary).
There's really not a lot a variety between hybrid coolers, so suggestions won't vary much.
More on the VRM fan gimmick: in the scenario that the VRM fan actually does anything(overheating VRMs), you've got bigger problems...
Flexibility: perhaps you've seen those popular radiator positioning videos...
Well, another way to look at them - 360 and 420mm models are inflexible, or lack flexibility, because the manufacturers don't change the tubing length at all from the smaller units.
Front mounting with tubes down is impossible with these units. Tubes up is the only way, but after an undetermined amount of time has passed, you will start hearing 'water running' or gurgling, as the air volume increases and more of it gets trapped at the inlet side of the radiator.
240s and 280s are short enough to get around this.