Yeah I thinking Teenage Dream is a master class in modern pop hitmaking, but her and her producers admitted that's exactly what they were aiming for back then. The album had no concept to follow and they simply took on every good song she could do. It worked and yielded awesome songs, though it was essentially a collection of singles.
But PRISM she had a concept in mind post-divorce, so it benefits from that traditionally in being a sort of exploration of recovery, strength, and commitment for her. PRISM makes more sense as an album when you listen to multiple songs at once, so it is easier for a full album play to me.
Teenage Dream is where a go to for one or two songs at a time, PRISM for when I want a longer run of Katy vibing.