Two of the worlds best parks yet two very different parks so heres my two pennys worth.
I am a coaster over theming/experience person
Cedar Point has got FAR better coaster quality than what Europa has.
So therefore I personally go with Cedar Point. It is however the classic "amusement park vs theme park" debate. If you are somebody who likes theming and all that malarkey, Europa will probably be the better park in your eyes. I however find Cedar Point untouchable to ANY park on the planet.