Did you know that the scope you've linked to, Leupold Mark 4 LR/T M1 6.5-20x50
, is not a FF scope? This is the FF version is that scope - Leupold 6.5-20x50 Mark 4 ER/T 30mm
If you're trying to stay in that sub $1200 range and get FF and that much, or more mag, the previously mentioned Vortex Viper and the Bushnell "Elite Tactical" model are available. You can find a listing here
. Note that there are FF and SF scopes in this range, but SWFA lists this variance in the feature list.
For target shooting at known ranges
... there is no advantage to having a FF scope.
I prefer FFP for most all uses but known range, competitive target shooting where the ability to split hairs is critical. There are benefits to both in their own best environments... so pick your scope based on intended use.
With a FFP, the subtention is accurate at all magnification settings. For many, this is preferred because no matter what the magnification, you have accurate holdover and windage reference, the ranging is still fully functional without adjustment, and... unlike the SFP, no potential exists for the reticle to alter POI as magnification changes.