Not personally a fan of 7 Wonders, while I enjoy drafting as a mechanic I don't feel like it has enough heft to make an entire game out of it.
I LOVE 7 Wonders duel! The gameplay and decision trees get really interesting, and especially playing against the same opponent repeatedly whole metas and strategies develop and get beat and repeat. Never tried the xpacs, as I feel the base game is so tight and interesting and I worry about adding extra bloat into such a lean system
I'd strongly disagree with this, Pantheon is pretty much a must in my opinion. In the base game you're forced to take s card each turn, but pantheon gives you other options, adding an extra layer of strategy to which cards you draw, and using the other actions at a good time to force your opponent to take one you don't want. I loved the base game, but I can never imagine playing without Pantheon now. Agora I've not played, but I've heard it's nothing special.