Whilst Phantasialand has some outstanding attractions and areas (Taron, Chiapas and likely Fly/Rookburgh) I simply cannot place it above Europa Park. The park is tiny, always feels congested and just doesn't have enough to do as a resort. I'd say this park is fairly overhyped by many enthusiasts. Don't get me wrong it is great still and I'd continue to visit every few years, but if I had a choice of where to go out of Phantasialand and Europa, I'd pick Europa.
Europa Park is a complete resort and has such a variety of things to do and whilst the Coasters may not be as good as the likes of Taron they are still incredibly good fun with the likes of Wodan, Silver Star, Blue Fire etc. The fact you can find something new in every corner and can just feel relaxed walking around or hopping on a transport ride (or 3)for hours on end makes it far superior. Then there's the other aspects of the resort from the incredible Rulantica, hotels to explore and Silver Lake Saloon