In all seriousness, I don't know enough about the French candidates. It's just my instinct. I see the division as between Thatcherite and Blairite approaches to economic reform. Do you want a savage beast, or a more gentle unifier? I think France needs a savage beast at the moment: I don't think Blair could have pushed through the reforms Thatcher made, in the climate of the time. Of course, the political system is also different. France doesn't give so much untrammelled power to the person at the top. But in the 70s Britain was supposed to be "ungovernable", just as now France is "ruled by the street". These things are not immutable.
Anyway, good luck to whoever wins. It would be great to have an economically dynamic France back in Europe, and I doubt that this will require destroying the welfare state.