Most people will use a SSP scope as your using dial in, not graduated holdover, so a FFP has no advantage, but it's personal preference to an extent as your typically using the high mag for range finding more accurately and shooting on a lower mag, perhaps 30, but again, it's personal preference, and everyone will have their way of doing it.
Personally I'm not a fan of FFP scopes at all for air gun ranges, but with a low mag scope for hunting they can be ok, but with high mag scopes the reticule becomes unusable at lower mags.
James