I think JOUY31's point about free luggage also for Silvers needs to be taken into account, that is an advantage of AF.
One other question: how about fast lanes at security? Being able to use Access No1 in Paris and fast lanes at other European airports is a plus for Air France. Does something similar exist for Easyjet?
And how about lines at check-in when you want to check in your luggage? Wiht AF there always is a counter for premium classes and/or status pax. Only one line with Easyjet?