I have owned both. If we were talking 6x with the LRD reticle I'd lean 6x. If the 6x has the duplex I'd say go with the Razor. The glass is really good on the razor and the reticle is quite good. You can dial with the Razor, there is no way I'd dial with the FXII. Those knobs go in the general direction at best. Once set it seems fine. I'd love to know the internal design of this and other scopes to better understand why that happens. As for durability, I think that goes to the 6x. I've had two Razor 1.5-8s, one came completely apart internally. The replacement seemed fine. The 6x has a solid track record over many years. I do really like that Razor, I could just never get over having one come apart on me which is why I personally would lean 6x. If my perception of durability is wrong, the Razor is really a better scope otherwise.