First off, I have both and have used both to great effect. I have to say that I prefer FFP over SFP. On my FFP scopes the reticles are extremely fine allowing for more potential for precision. FFP reticles can be used to range targets with practice at any magnification setting. My FFP scopes have lit reticles and are extremely useful at 3.5X for a close range work. Then when I need the magnification and I zoom in on the reticle it doesn't cover up my target at longer distances.
My SFP scopes tend to obscure parts of if not the whole target at longer ranges when my target is small. That's not to say I can't use my SFP scopes at long range because I have and will continue to do so. It's just that I find FFP scopes more useful. The first thing I find myself looking for in a scope when I am shopping is if it is FFP or SFP.
Which do you prefer and why?