I gotta go with the Nugs. They're culture atm seems impeccable, and they have such great pieces around them at the moment. I would say Mavs, but KP isn't looking great this year.
I can go with my normal answer and say Steph as a Warriors fan. But I'm a big fan of Jaden McDaniels. Grew up at the same time in the same hometown. Played at the community center with him, he's a cool dude. F the 6ers announcer who mocked him when Tobi dunked on him tho.