For what it’s worth. I’ve been running the 120LL with 3 diffusers at 7 feet depth (used to be deeper), one Vertex dual 9”, and two Matala 12”” singles. To get equal flow from each, the gate valves supplying the Matalas need to be closed off slightly. Meaning Matala can move the same air with less pressure, as discussed before. I would guess the difference in pressure required to operate, is less than 1psi between diffusers brands.
Both types perform quite well, Vertex getting the slight edge in quality but, the value is offset by its high cost.
The 120LL with Matala, is easily a winning combination when measured by effectiveness, efficiency and value.
When you say effectiveness, can you post how many GPM it bring to the surface in comparison to the Vertex? That's what I would consider a measure of effectiveness.
