I've done the A380 line, and the A330/40 line (and the Boeing Factory). I would highly recommend both of them! I would say the A330/40 was better because we actually walked in the rafters above the aircraft being built- was certainly amazing to see. Whilst the A380 was impressive, we just observed from a glass viewing box at the end of the room. Though I wouldn't know how you would go about booking a tour - I was part of an organised group. The website is Taxiway.fr so that could point you in the right direction!
On a side note, if you've done the Boeing tour, I think you'll find the Airbus one far more interesting. The tour guide explained to us about the different materials used, where parts were sourced from, process of making an airframe etc., whereas the Boeing one was horrifically dumbed down, and was more a "We are the best" type of tour.