Re: SFP for Hunting?
Having done it both ways a fair amount, my advice is if you're planning to use the reticle for anything (holdover or wind) FFP is the smart choice. Especially if the scope is above 10X.
While you may be able to crank the scope to max power any time you want to use the reticle on a sunny day at the range, it's often not practical or advisable when hunting. From low light conditions where you just can't see very well on max power to issues of speed--if the animal does happen to take off running after the shot and your scope is cranked up to 24X, good luck getting on him again quickly for a followup shot. Those things are less of an issue with a scope that maxes out at 10X though.
If you plan on using the scope for quick holdovers, how quick do you want to be? Hunting can be similar to a timed match in that it can be a pretty high pressure situation when the action starts happening. The term "buck fever" was coined for a reason. Planning to use a reticle that can only be used on one power, a power you typically don't walk around with the scope set on is almost setting yourself up for a mistake.
While naturally not all scopes are created equal, a good FFP reticle, especially with good illumination, is as good at any power and in any possible hunting situation as a SFP reticle. There is simply no advantage to be had with SFP. If you were talking about varmint hunting that would be different--lots of good FFP reticles could be deemed "too thick" for that. But not hunting big game.
So when there is nothing to gain, no advantage to be had with a SFP reticle, why would somebody choose the handicap of effectively turning their variable into a fixed power scope anytime he wants to use the reticle?
Of course all of the above only goes for those planning to use the reticle for something in the field. If you're going to only use it as a glorified duplex, it obviously doesn't really matter.