I am not as seasoned on both products as San Gottardo.
I have only flown once on AF new 77W (but many times on the A380) and once on LH 748.
AF F seat on A380 is ancient and offers no privacy. I would avoid it.
AF 77W has only one row (only four seats not four rows as mistyped above) and I find it a bit claustrophobic and much prefer the nose of the 747 on LH.
LH catering and wines are superb and original. With only four seats (and possibly only a couple of pax) AF catering offer less choices.
I find the AF 77W screen rather smallish and far away.

Otherwise I fully agree with San Gottardo's comments. But I would never pay to fly AF A380 F.
If you do not have preference for destination, I would also consider LX.

I know that there is a lot of BA bashing here. But I find their F suite on the A380 truly excellent, especially if you have a window seat, at least on par or better than the standard new F seat as on AF and many airlines. I have flown it many times. But BA 747 is the worst in F and not much better on 77W middle seats). BA A380 F window seat plus their excellent catering/wines (not Champagne make me very happy at reasonable price.