fairlight has the regular/tall sack differentiation which is very nice for sizing properly and gives someone a lot more wiggle room for avoiding the terrible cockpit setups on the past page.
I only comment this as I have a kepler and I am currently struggling to make it fit/work for me.
On one hand, people buying the wrong frame but on the other, they've overstated the versatility a little.
Maybe they mean more verasility if your other grav grav is a Crux..
https://bikeinsights.com/compare?geometries=610423b9107089001cb0ec1a,615f289817695e0020dc651f,
But hey, choices! Throw the fairlight lineup into that website and they basically all look the same.