Currently Online 
Hmmm, that's a tough one since I enjoy playing a variety of genres, but I would have to say FPS games. And I don't mean modern live service FPS. Although I still enjoy playing multiplayer from time to time. But I mean single player story-driven. Your Halo, Half-Life, System Shock, Wolfenstein, Doom, Crysis, Titanfall 2, STALKER, Bioshock, Killzone, Resistance, Prey, Metro, CP2077, or the original CoD Modern Warfare 2007-2011 trilogy where the campaigns were these awesome action blockbusters.
Majority are very distinct from each other, whether they're Action-Adventure, RPG, Immersive Sim, etc. but they all still feature FPS gameplay that I tend to have a lot more fun with because it just feels more engaging to me.
Other biggest genre I love that I was fighting on whether it would be first or not is Real-Time Strategy. This was the first genre of games that I was ever introduced to as a kid with Command & Conquer: Red Alert which over the years led me to the likes of Myth, Age of Empires, StarCraft, Warcraft, Rise of Nations, Empire Earth, Homeworld, and Total Annihilation, games that I still go back and play to this day. There's even been some great RTS games that have released in recent times, but just nowhere near the way they used to be.
You called down the thunder, now reap the whirlwind
