I think he's just saying it's a bit too complicated for him to produce a good performer. And, I know that, for me at least, while I may be able to figure things out alright (kind of), as soon as I get tools in my hands, I end up in the hospital, so Waterblock design is too complicated for me to produce a good performer.
On another note, IMIO (in my ignorant opinion) you should pick whichever has the least pressure drop since I imagine you will be running the two in series.
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