Happy new year
I have had the quad, Geissele, and RAHG. Both the Geissele and RAHG feel better in the hand than the quad. The Geissele has some "steps" to its curve that I suppose promote grip. I didn’t see too much difference between them though, so I put them in the personal preference category.
As for the GB, just get a spare block if you are adverse to cutting the loops.