Canonically I think it makes sense that I Annabelle would enjoy getting big the most because she's always been so skinny and small. Whether she gets bigger or fat she'll find it sexy and enjoy finally having curves of her own.

In the non canon kinkier pics I think it kinda just depends, we've seen Vicki really like her hyper breast expansion and Krystal was really into her weight gain but I think Annabelle makes the most sense overall cause shes the smallest of the cast.