The ffp scope "math" is easier as holdover mils are mils & holdover MOA is MOA @ any power. Ranging is the same.
The sfp scope is calibrated in Mils or Moa either @ max magnification/power(24x or @ max power and half power(24x and again @ 12x) depending on Manufacturer.
Due to this the "math" takes a little more awareness when you change from half power to full or vice versa.
FFP is usually more expensive to buy and enlarges the target AND the reticle when one zooms. So not a bad deal for tactical use @ close ranges and low power.
The SFP is good @ longer ranges if one considers that the reticle doesn't get bigger with power and possibly clutter the view. I personally like the fact that one can change the relative size of the Mils or MOA @ different power settings.
It is easy to learn either FFP or SFP, it just depends on what you get comfortable with.
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