I've just downloaded genie scout and it says that benaglio has better positional rating.
His hidden attributes are a little better(14 vs 10 important matches)
My assistant manager has 19 for judging player ability and potential and he tells my the same thing like genie scout says about all my players.
I've seen also that many players with strong weaker foot have better ratings than other players with better skill but weak rating for weaker foot.
For example I have 2 Brazilian strikers Guilherme and Marquinhos. Marquinhos has higher attributes than Guilherme but Guilherme owns a better weaker foot.Genie Scout gives a positional rating of 84% for Guilherme and 82% for Marquinhos(Torres from Liverpool has 87-88% ).According to Genie Scout Guilherme is better.My Assistant manager tells that Guilherme is a little better).
Another good example is Danny from Zenit.He hasn't very good attributes but both feet are very strong.Genie gives him over 80%.
It looks like the ratings given by genie are accurate and weaker foot skill has a great impact.These facts were confirmed by my Assistant manager(19 for player ability and potential)
Benaglio has 18 vs 15 concentration and 15 vs 13 aerial ability
Hidden attributes Benaglio vs Mandanda
Consistency 18 vs 17
Dirtyness 5 7
Important matches 14 10
Injury proneness 5 5
Versatility 11 5
Adaptability 15 10
Ambition 16 16
Controversy 3 8
Loyalty 12 13
Pressure 15 17
Professionalism 17 15
Sportsmanship 16 15
Temperament 17 13