Ferrari and Lotus do provide highest average race speed without destroying tyres and having too high delta between fresh tyres and used ones. But I don't understand this stupid mania for less pit stops. If someone wants to win the race and with fresh tyres he is faster enough than the rest of the field, why not?
One of the classic wins for Michael Schumacher was exactly like this in France when he pitted 3 or 4 times- one time more than his competitor then, I don't remember who he was.
And yes- tyre change will most likely benefit RB the most and it is quite clearly written:
Red Bull's RB9 is widely believed to be the car that produces the most downforce in Formula 1 this year, but it cannot make use of all that peak performance because it puts the tyres under too much stress.
The nature of the challenge of looking after tyres means cars that are more mechanically sympathetic like the Lotus and Ferrari are better equipped when it comes to being consistent in the races
http://eurosport.yahoo.com/news/formula-1-pirelli-can-bring-back-processions-165556987.html