Really nice review.
Just one thing. You can't ever compare aircoolers and sealed loop coolers to a proper watercooled system.
Especially comparing a full loop vs a shitty H50.
Why not compare the loop to a H100 or a Kuhler 920 with push pull fans.
A couple of other things.
The Price of a proper watercooling setup is immense compared to a closed loop or a high end aircooler.
The weight of a full watercooling kit is not ideal if you plan on lanning.
The chances of a leak is immense.
Maintaining, cleaning of the watercooling kit sux..Did I mention it leaking?
Watercooling is only effective if the ambient room temp is low.
There are a ton of factors to take into account..Not just the temps.
Edit: Should also add, even while running a highly overlcocked cpu under a proper watercooling setup there can be some bad effects. So even though its running cool you are still most likely degrading the cpu and shortening its lifespan, depending on the overclock and voltage used ect.