From all the ones I visited, I would say LFMM ( Aix en provence ) First . ( compare the days worked, the hours, the sunshine, the strengh of the Unions, the number of controllers versus number of aircraft, and the landscape .. And the new ACC , in a park right in the middle of the city, with the windows viewing the lavande hills....
Women, food and local wine are extra....
Only drawbacks : cost of living and too many British tourists.....