Efteling do kinda have the benefit of being a charity so don't have to give a damn about profits, Phantasialand haven't always been ones for the real high quality we've seen in their investments since Black Mamba...
Half the time it's all relative anyway, since few parks can build a Baron or Ghost Train... But it's when places like Hansa Park are building things that wouldn't look out of place at Disney is when you have to be questioning where the money actually goes in Merlin's ones...