My expensive scopes on my powder burners are FFP. But I’m told it costs a lot of money to lock down lenses in the manner required to prevent POI drift with FFP. So on a budget, I tend to go with SFP since it dies not suffer the POI drift like FFP.
Someone told me that holdovers are not that hard with SFP if I stick with magnification levels that are easy multiples or easy divisors of the magnification level at which the reticle is indexed. For example, if the reticle is indexed at 10x, then I use half as much hold at 5x, twice as much hold at 20x, etc. I haven’t tried it yet though. My 4-14x is indexed at 10x, so I plan to work up my holdovers at 8x for easy application at 4x, 8x, and 12x.
Another issue with FFP is that the bottom of the holdover tree can drop out of the field of view at higher magnification. Using an airgun at 100 yards can involve a lot of holdover at exactly the time you want to use a high magnification. Depends on the airgun power.