No inserts are close to the gen and differences increase the brighter the light is. I've compared ARF, noob, VRF, cerameister and gen. I had an ugly dark noob insert on my v7. If you don't want to mod anything, go with the ARF. It looks the bomb and ARF "platinum" is almost soongebob quality. It looks very, very good. If you're not bothered by the whiteish numbers, go VRF. If you want the best (which is subjective) that isn't gen, get vrf with spongebob mod.
The cerameister is better than the dark green old noob inserts, but it's close in hue, just lighter. The numbers are silverish, not platinum like spongebob or arf.
Closest in hue to gen (but still nowhere near as vibrant and saturated in good light) is VRF. I got a vrf on order from Spongebob. Of course this is very subjective. Different people are bothered differently by differences in hue and lightness...