Considering the game has more road cars than race cars, and considering Ferrari is a more popular/prestige road car company (probably the most) then i'd fail to see how you can argue that.
Personally, I (and many others) prefer Ferrari cars and there have been plenty of Ferrari's in Le Mans series racing (both the 458 and 430 are being raced). Outside of Le mans series races where do you see Porsche racing in these modern days?
Couple of examples
Touring cars? no.
Rallying? no
NASCAR? no
Formula 1? no
Indy Car? no
So i'd say in modern motorsport Ferrari are just as important as Porsche. If you go down to the smaller series races there will be more Porsches being raced, but then also there will be more Mazda mx5's being raced too.
So yeah, personally for me, road cars or race cars i am more of a Ferrari man, which is strange because i'm not a Ferrari F1 fan.