Gah! This is a tough one since I watched both of these all the time with my grandparents, but I gotta go with Jeopardy! Wheel of Fortune regularly drifts into one contestant dominating the episode, and that’s less entertaining to watch for me.
Wheel of Fortune is way more fun to play (especially the Tiger handhelds and the NES game), but I like watching Jeopardy better. Wheel of Fortune is just boring.
Sonic just wouldn’t make sense. Mario has had more experience in the snow, he is jolly, and he has a Santa Claus suit, as seen in Mario Odyssey and Mario Kart Tour. And, Santa with a Wing Cap? That would be frickin awesome!