Well... Aristotle was a scientist as much as he was a philosopher; although he prefigured the scientific method in many ways, the blind obedience to his teachings kept science back after a point... It wasn't until the Condemnations of 1277 in Paris that scientists began to move forward... and even then, it was a fairly slow progression until the high renaissance.
Plato was more of a "pure" philosopher, while Aristotle was a polymath, in that he was good at many, many things, such as botany, zoology, philosophy, and literary criticism of all things.