Ive ridden rigid for quite a few years and on a few different forks and bikes.
Niner is very rigid with little bump forgiveness, White bros/PRO Components is my fave fork (same fork, different names), its stiff as but has some suck up with trail chatter. Surly steel was nice but heavier than a OEM Susp fork. Carver on my fatty was (and is) good, but got 4.8" of tyre suspension to iron out the trail. Dengfu on my current fatbike, the same, carbon, china, does the job.
My choice is PRO Components, best rigid fork I have ridden that is stiff, solid and sucks up the trail chatter.