Furball, I have a lot of experience with these glues. My guess is it was me...

Davlyn Green: Works best for Ultra hold users. Also I here it works better for all lace.
Davlyn Black: works best for while glue users. Also tends to be better for poly base units.

For me I use black. Ultra hold gives me a 4 day hold where o.r.w.g gives me a week hold. When I tried green I got a 5 day hold, and black held up for a week. Both under water conditions. I use a thin layer of ( what was once called lase sealer ) to make a poly perimeter. I do this so I can put the glue directly on the unit. I do my front line the normal way. I like this because it keep glue out of my hair better. So that maybe why black is better for me.