It is my understanding that it is not so much which scope (FFP or SFP) you get but what you intend to do with it once you get it. If you're going to shoot in tactical style matches where time is a factor 99% of everyone will tell you to get a FFP. If you're just shooting targets at known distances or at a place where you can use a range finder most people would probably tell you to get a SFP.
The reticle gets a little thick on FFPs at higher mags but it don't matter to tactical shooters because a hit is a hit, doesn't matter (from my limited understanding) where you hit it. All hits score the same. But usually guys shooting at paper targets (usually at known distances) where you have an "X" ring, 10 ring, 9 ring, and so on, prefer a SFP because accuracy is important. A hit is not a hit, it does matter where you hit the target. Typically guys that shoot for groups and that wants the pin point accuracy will shoot SFP. Before I get slammed by the FFP guys I'm not saying you can't shoot just as accurate with a FFP, it is just not typically found on the firing line at these events. Just as SFP scopes are not usually found at tactical shooting events.
The same can be said for Magnification range as well. Again, it is my limited understanding that guys in tactical matches usually don't use high mags when shooting these events, they may have it, but will choose to shoot what they feel is the lowest possible mag. because they want a greater field of view. Where as the KD shooters typically want all the mag they can get.
I'm not the know all end all of these events, and if I have made a mistake in my post I'm sure someone here will break their fingers posting a reply to let you, me and everyone else here know about it. .