This one seems pretty easy. Prawn boards.
Diode count per $$ seems similar (2100 for 8400 nichias, 1500 for 6000ish samsungs+ali crees) so what do you trust more, an ali vendor or a forum sponsor?
Also, i saw the the or_gro side by side tests:
Prawns beat hlg samsungs with hlg monos+uv. It was close but defo a win. And this was even with ppfd and spectrums pretty much equalized.
In this case youd be using ali samsung diodes which i cant really believe will be the same as hlg. Also the prawn boards are 90cri which means more balanced spectrum: less blue dipp around 470-480.
Your in the uk and i assume comericial: who grows 60 square feet of weed for own consumption??? The extra cost per square feet is 10£ (sorry getting confused with $$ and £) and weed is expensive in the uk. Like those 10£ are worth what, 3 grams??? I believe in the many cycles youll make with these boards the prawn boards will make you those 3 grams over and over again.
Also: if something goes wrong and one breaks, who would you like to deal with prawn or the chinese? Who ya gonna call
????
No prejudice whatsoever but i bet you prawn would take better care of you. Hell, i think even if he made you buy a new board youd still be making better coin with prawns. Well, i know its growlights oz, but i bet you the same.
The little money difference per dioode makes this a easy decision