I like this way of doing it. For me:

Nostalgia and all-time enjoyment, probably Pokémon Gen 2 / Remakes (Silver / Gold / Crystal / SoulSilver / HeartGold). I consider them all one game of different “flavours”. If I had to choose one I’d probably go with SoulSilver. The remakes added some much needed modern conveniences, and having your Pokémon follow you around in the overworld was awesome.

Pure “this game is so good”, probably Elden Ring. Before the DLC I’d probably go with Dark Souls III because of Gael and Friede, but Shadow of the Erdtree blew me away.

Most hours played, Skyrim at over 5,000. HITMAN is in second place at a bit over 1,300.