I hate to be a gramar nazi, but its "Your Favorite Airline" or since your inquering about economy, it should be "your favorite economy airline"
To answer your question, from my experiences I think that Air France is the best for seating, and cost. And VS
is the best for amenities, and IFE.
I have flown AF
18 times and they still have not failed me. I have flown VS
6 times not failed me yet.
the seats have a foot rest in economy so it makes the ride more comfier.