Personally, I don't know of any advantages a SFP scope has over FFP. In case you're unaware (apologies if this is known information), the difference between the two is where the reticle is located in the tube of the scope. With SFP scopes, the reticle is the exact same size throughout the magnification range HOWEVER the downside there is typically the measurements on the reticle are only good at a single magnification level, usually highest power so trying to use hold overs at any other magnification get tricky. On FFP scopes, the reticle is smaller at the lowest magnification and gets bigger as you zoom in. Downside there is low power shooting can be a little tricky due to the small nature of the reticle (depending on the design, ACSS shouldn't be an issue though) but it pays off because say there's 1mil gaps between the lines on the reticle, that 1mil gap is the same at say 6x that it is at 18x making range identification, hold overs, and any other measurements much easier. All of my magnified optics are FFP for this reason. I've got a Bushnell ERS 3.5x-21x on my long range bolt gun, a SWFA SS 1x-6x on my AR, and an Athlon Argos BTR 6x-24x on my NRL22 bolt gun.
I'd prefer SFP for a typical LPVO. My Kahles K16i (with the SM1 reticle) is a SFP 1-6 and the horseshoe-dot is very large at 1x and makes for very quick target acquisition at close range (the very generous eyebox helps, too). Most FFP LPVOs have a rather tiny reticle at 1x, which may not bother some people but others may find it less than ideal. I would reason that with such a relatively low max magnification, if I'm shooting at a long enough range to warrant using the holdover subtentions on the reticle, I'll inevitably be at max magnification anyway.
Valid points. My 1x-6x SWFA has a donut style reticle at 1x with a small crosshair in the middle and when you zoom in to 6x the *donut* portion disappears and you're left with a clean reticle with all your holdover measurements.
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