Well lets analyse:
Aside from the midfield (Croatia is incredibly strong in this area) French Squad is somewhat stronger. They also have more international experience. Head 2 Head record also favour France (3wins 2draws 0 loses vs Croatia).
Croatia should be more tired due to 120minutes games they played.
Both set of players will be under massive pressure (France probably more so), both of them will be incredible motivated (Croatia probably more so).
I see this almost a 50/50. I will have to say France.
I want Croatia to win to be honest. Need new faces as world cup winners!