It comes to mind that a good basic "catchphrase", rather than pleasure or atomism, is simply "Physics, Canonic, Ethics".
This emphasizes the complete worldview in a synoptic way. If someone you are trying to introduce to the philosophy then has specific questions, they can be clearly related back to the big picture.
As I recall, the Stoics use "Physics, Logic, Ethics" as their basic structure. And for me that's where Stoicism fell apart: the moderns try to sidestep the physics and its emphasis on logos, the logic was baffling, and therefore the ethics had no grounding. On the contrary, the strength of EP is that it holds together as a complete worldview and it seems most effective to present it in this way.