I've been meaning to do this for a while, but here is the list of what the girls prefer. Actual values will depend on what mementos you have and if the item will overfill the need cap, but I compared every coin bought item that has matching values for which one will give more affection.

Mary: Game: Dancing snake. Gifts: 15s: Single rose. 40s: Classy bouquet. Food: No preference. Bath: No preference.
Sakaki: Game: Spiral. Gifts: No preference. Food: 60s: Takoyaki. 150s: Veggie-loaded ramen. Bath: 150s: Aloe vera mask.
Cleo: Game: Cat race. Gifts: No preference. Food: 150s: Beef burger. Bath: 60s: Magnesium oil. 90s: Pheromone spray.
Raquel: Game: Line breaker. Gifts: No preference. Food: No preference. Bath: No preference.
Annabelle: Game: Sky jump. Gifts: 40s: Theatre tickets. Food: No preference. Bath: 50s: Strawberry mask. 150s: Chanel 69.
Leilani: Game: Switch the gravity. Gifts: 40s: Hummingbird Sculpture. Food: No preference. Bath: 60s: Sandalwood.
Yasu: Game: Bridges. Gifts: 15s: Small plushie. 40s: Classy bouquet. Food: 120s: Raw blueberry cheesecake. 150s: Veggie-loaded ramen. Bath: 50s: Strawberry mask.
Eva: Game: Waifu flip. Gifts: 15s: Small plushie. 40s: Hummingbird Sculpture. Food: 60s: Natural ice cream. 120s: Raw blueberry cheesecake. Bath: 60s: Sandalwood incense. 90s: Cinamon honey mask.
Valentina: Game: High roller. Gifts: 40s: Flamboyant white wine. Food: 120s: Makizushi. Bath: 60s: Magnesium oil. 90s: Pheromone spray. 150s: Aloe vera mask.