It’s a boring answer, but it was my baby doll(s). I had one- Ginny- that was hard plastic and realistic (I mean, not too realistic, but she was made to look like a baby rather than a cartoon) and she was my favorite until I got a Bitty Baby. Mine didn’t come with anything and I promise you, she was $35, not $60. I remember that distinctly because, of course, I pored over the catalogs and dreamed of an American Girl doll and all the wonderful accessories, but the regular ones were way too expensive and I never would have gotten Bitty Baby if she hadn’t been relatively reasonably-priced.
Anyway, Bitty Baby (Michelle) was softer than Ginny, which just made her nicer to hold and play with, so she became the favorite baby.
I did eventually get my American Girl doll once I was old enough to save my own babysitting and dog-walking money. By that time, I was too old to really want to play with her, but I loved her all the same.