maude11t For me, it would be:
- Expansion Pack - Cottage Living, hands down. Henford-on-Bagley is my most-used world, and I need the Simple Living Lot Trait, oversized crops, and milk and eggs. (Runners Up: Horse Ranch, Growing Together)
- Game Pack - Dream Home Decorator, not for the gameplay but for the Build/Buy. I use at least one of the cupboards, doors, stools, or couches in every build. (Runner Up: Outdoor Retreat, and I'd probably buy Spa Day again - on sale - just for the Yoga Skill)
- Stuff Pack - Home Chef Hustle, because I can't live without the kitchen. Also, the small appliances and the selling table that lets you sell portions of meals really add to my Simple Living gameplay, as above. (Runners Up: Tiny Living is a very close second, for the Tiny House Residential Lot Trait and its perks, then Crystal Creations, Paranormal, Nifty Knitting)
- Kit - Greenhouse Haven, for the windows and doors. I'm not sure yet if this recent base game update will change my answer here; I haven't played with the new glass wallpapers yet. (Runners Up: Blooming Rooms, Sleek Bathroom, Cosy Kitsch)