Temple Run is an original, popular, and successful game by Imangi Studios. It was picked up by Disney to become Temple Run: Brave, a tie-in to the Pixar/Disney flick of the same name. If you haven’t already downloaded it, do so now. We’ll wait.
Pyramid Run is a horrible rip off of Temple Run. Do not download it. I’m not even going to link to it, but the similarities are clear. It’s not even a careful attempt to re-skin or remix the original. It’s a blatant cash grab, as you can see when you read the predominance of one-star reviews.