I don’t have a PAR meter so I figured the best I could do is take a photo in manual (manual photo app on my phone) in the same spot with both lights:
Kessil A80:
Full intensity all blue-
Full intensity, half blue and half white-
Full intensity, all white-
Maxspect L130:
Lighting effect P3
Lighting effect P2-
Lighting effect P1-
my opinion, I like the Kessil more for my application (9 gallon tank). I think it is brighter (but just barely), it offers a nice shimmer effect, and I feel like the corals/anemone look better under it (again just barely). That said, it is only a tiny cluster of LEDs so it your size tank the Maxspect may actually be a better option (though at the price point there are a lot of other options (as others have posted).
TLDR: I would choose the Kessil for my 9 gallon, probably wouldn’t choose either for a 20 gallon (but if you had to pick one for that situation I would pick the Maxspect), and both are nice lights!