too early to judge Deschamps on how well he's doing for the French NT, but the signs are promising.
Blanc didn't do too well with France, but lets not forget the work he did at bordeaux, which imo is phenomenal, the French NT has always had a poisonous environment, and its never easy to coach them. I think that should not take away from blanc at all, i personally rate him as a coach and think he'd do well in club football.
Deschamps was inconsistent with Marseille, though all in all he was quite decent for them, however his work at Monaco was amazing, I think he might be a slightly better coach than Blanc, but imo even that is debatable.