I ended up going with the cryorig because I couldn't see 40 quid in value in getting the kraken. Used the saving to get some thermal grizzly and will save the rest for games. Either way, I'll post my temps so hopefully we'll have a definitive answer
I have a dh 15 a kraken x62 and an ek predator 360. From my point of view the kraken x62 can cool better than a dh15 and look way better doing it but there is a downside to this. In my testing for personal observations it cooled only roughly 2/3 degrees better at the offset of being very very loud to to achieve this. You also have to use the NZXT cam software which is hit and miss depending on who you talk to. There is no doubt it looks great the performance is decent just don't expect it to beat the top aircoolers from various manufacturers by a huge margin.
THere is idle pump noise not obtrusively loud but certainly under idle condition you may notice your system more. Of course any top aircooler under idle you will just notice the fans/airflow.
THre is also the cost factor the Kraken when I got it was roughly about twice the price of the dh15. Only you can decide if this is worth it. If you are looking to make something that is pleasing to the eye and have decent performance then the Kraken may tick some of the boxes for you.
I have a 5930k at 4.4 ghz @1.26v when I was testing it for stability the kraken was overwhelmed. I don't consider my overclock an extreme one. If I ran it at stock then I would be comfortable using the kraken.
How long did it take to saturate your kraken? An hour of prime at the lowest pwm curve 0.75%/1C and I sit nicely at 55C with my 3770k at 4.5ghz.
I imagine a 59xx cpu pumps out a fair bit more heat though.