Both the Razor and ACOGs are fixed power gun sights. The advantage to the ACOG is it has a bullet drop compensator or BDC reticle so you can hit out to range. If you choose these optics ( along with any other RDS style), you must decide what kind of shooting you do the most of. Anything under 100yds, a regular 1x RDS with a 1-2 MOA dot should work fine. If you shoot 3 gun, then a magnified optic like a 1-4x would work better. I want a light rifle ( and due to budget constraints!) so I decided to sacrifice accuracy on the distance shots and try and make up for it on the closer ones.
RDS and holo sights have the advantage of a wide field of view and to shoot with both eyes open at close quarters. Scopes mostly have a fixed focal distance so close quarter shots take practice but you make up for it on distant shots. You need to decide what you want to do and strike a (imperfect) balance.