Indeed Europa are run by Mack, but for me, the real clincher is how they treat guests, with a fantastic viewpoint on throughputs, and the overall feel and cleanliness of the park...
They also have something for everyone, and it's not just the rides that are the focus, the shows, the vibes, the look of the park are what set it apart from the majority... In reality, they only have a few 'quality' coasters out of the 11, but they are perfect for their guests... But for those who don't like big rides, there are walkthroughs, hidden dark rides and of course the shows...
They just seem to know what people want from the park, hence why their 5 hotels have a 98% occupancy rate, meaning they need a 6th hotel to be built...