I only have one on a sun shelf... it does a nice job of lighting my sunshelf.
I have 3-5g lights in the main part of the pool. With some colors, I wish it was brighter... but that is just my preference. White looks very good. Blue pretty good. Red does not cover the entire pool.
I wish Pentair published info about the lens and lumens for their lights, but they don't. I believe, from my experience, that the globrite light has a lens designed for shallow water... not as wide angle as the 5g. The 5g, I believe, has a wider beam angle... both in height and width. And is also adjustable for wide areas or narrow areas. It definitely puts out much more light.
It also depends on your plaster. I have French gray. white plaster would require less light to get the same look.
I would highly recommend using the 5g lights for the pool and globrite on a shelf or swimout (I wish I put one on my swimout... it is dark since it is above the level of the main pool light). I don't think there is really any advantage to using the globrite... since you will need more of them and the cost will equal out... Niche is same cost... just less labor for PB since PVC sleeve is easier to hang than full niche.