I have a FFII with the 3MOA dot. A buddy got the FF III with the 8MOA dot. After seeing his 8MOA, I think I might like it better. It would be easier to judge how far a turkey was with the 8MOA in relation to how much of his head it covers I would think. So, I think it's a personal preference.
I do know I HATE how his FF III cycles thru the bright to dimest settings. I think they should have started dim then cycled to brightest then off. My buddy says it's a PIA to know if it's off if you don't count the cycles trying to figure out if it's off or on the dim setting.
I do like being able to adjust it now without the locking screws on the rear of the sight.