Both, though I mostly just play online. I have a physical deck, but I've only actually played it against my sister, because, well, I'm introverted and have a hard time asking people to play against me even when I am at the local comic book store where they have weekly Pokémon leagues... Still, I buy new cards pretty much every time I go there, and there are several cards I want not for their actual viability but just because... I don't have them, and in some cases they might be of Pokémon I just like. Like how last week, I traded away some rare cards I didn't care all that much about to get a BREAKpoint Gyarados-EX secret print and a BREAKpoint Togekiss-EX. Did I want those cards to use in my deck? No, (though Togekiss might get used anyway) it's just that Gyarados is my favorite Pokémon and Togekiss isn't that far behind.