My favorite video game is a tie between Geometry Dash and Smash Ultimate. They have great differences, and when makes both games special are the things that I cherish the most about them. Geometry Dash demands that you meet multiple stages of competence for every hard level you commit to, and it's all hard work throughout. Smash is a slow, repetitive grind that you improve in a way that is measurable mainly by long-term tournament results. You don't usually feel yourself improve in Smash as far as I can tell. My efforts could be making me improve right now and I don't even know it. The sheer amount of interactions, matchups, and ways to play the game make Smash Ultimate a truly beautiful experience.
As for my favorite non-video game, gotta go with chess. The game's complicated and I'm not too great at it, but it's a great way to get you to use your head and think about your options. I get frustrated at the game because of how many stalemate situations I keep getting myself into, and frustration with my current knowledge is a wonderful thing because of the vast amount of things that I don't know. I can't doubt that there's deep beauty in chess that I can't even see as a low-level player. As a competitive Smash player, being bad at something competitive is a different perspective that I like to experience at times.