They are very different scopes. One is more geared toward fixed-range competition like F-class, BR, etc, and the other is more designed for unknown ranges, tactical, or hunting situations.
One thing about the PST is that the glass isn't the same in each scope, so look through the one you buy before purchasing. The glass in the two I'm using, one 6-24 FFP and one 4-16 FFP, is fantastic (about on par with Leup Mk4, Zeiss Conquest, etc).