For me, I take FFP, the reason if your RF dies in the field, you can range your target, although have to know the formula you can do the same with SFP, however you have to remember the power must be set to whatever the manufacturer states to use, usually max power. The second reason would be the wind hold, in a hurry a nice bull is about to walk into brush, you need to hold for wind and forget to max power in a SFP you will more than likely miss or worse bad shot. Just my opinion, or the reason why I use them.