Intelligence is a word, a messy abstract concept. If you treat it as an existent quality like height or weight, you end up with absurd questions that have no answers, like "Who was smarter, Picasso or Einstein?"
and it's not because Einstein was a brilliant physicits.
Intelligence refers to how well you can reason abstractly, not to how successful, how competent, how eloquent, or talented you are. for that we have those words.
and Einstein would have still been more intelligent even if he never discorverd anything.