Lufthansa/LOT/Austrian are usually a bit cheaper than Airfrance/KLM on this route (bit below 200 eur vs. 210/220 in discounted eco). Doubt that you have lounge access in AMS or CDG unless you are elite plus or flying business. Or you have to purchase it - but, you might as well just enjoy a nice restaurant in VIE or MUC or FRA if you have the time to spare between the flights.