I feel like I would get bored of life if I lived in Stardew Valley or AC. Life is simple without danger, but it's also repetitive and there's not much going on. I get bored of playing the games sometimes, imagine LIVING in there 24/7.
Living in BOTW as an NPC has got to be extremely boring, living as Link is way more fun but it's still lonely.
Rune Factory is a little different, there's a little more danger and a little more of a goal to work for. Also having large giant monsters as pets sounds amazing.
However I'm going to go a different route and say Skyrim. Lots more danger and lots more chances to die, but that can be easily avoided if you don't go into dungeons and run away when a dragon attacks, or just let the guards handle it. I can spend hours horseback riding in the open world, max out all my skills, complete all the main, side and faction quests, somewhat decorate my houses, thou no where in the same extent as AC or Stardew Valley. When I get bored of cold Skyrim I can go to a still cold but now also ashy Solstheim. There's many goals to work towards, weather it be killing the World-Eater, becoming leader of multiple factions like the Mages College, Theives Guild, Dark BrotherHood and Companions, becoming an overpowered god, collect everything, become a werewolf or a vampire, sign a contract with every Daedra so they can battle it out of who gets your soul in the end, there's just alot more to see and do. No two players experience in the game is exact.