The primary differences between the Strike Eagle and the Viper PST is that the Strike Eagle can zoom further, offers a wider field of view, has a shorter eye relief, and has a slightly better reticle.

The shorter eye relief gives you the wider field of view, but will make it slightly more difficult to reacquire targets, depending on how much recoil your rifle has.

The reticle has wider posts, which make for easier target acquisition. The reticle is also a bullet drop compensator (BDC) style reticle, which makes it easier to shoot at longer ranges.