Project.el vs. Projectile: What things can one do that the other cannot?

If you've used both project.el and Projectile I want to know what are the differences between the two.

I learnt on IRC that Projectile is much older than project.el so there are more plugins for it. But I want to know some specific examples of things that Projectile can do but project.el can't. And specific examples of things that project.el can do but Projectile can't.

Anyone has good experience with both to share this stuff?