As stated in another post, decide: small or big? where on the yeshivish/non yeshivish spectrum?
Pros/Cons to big: the seminaries you mentioned were larger: BJJ, BYA, Bnos Chava ect. They are great if your daughter is a real socialite who needs 30 good friends this type may be for her. More of a variety of girls. Can be clique-y when there are so many girls there.
Pros/Cons to small: Less girls so it is better for those who dont want to be overwhelmed by the sheer numbers and types. Smaller seminaries may choose the exact girls to go that are a certain “type”. This is great for those who like a few really close friends but is friends with most of her seminary. She will know almost everyone at the start (a real struggle for some), have attention from the teachers, and there is a certain school spirit when girls know everyone.
There are also differences in academics. Some sems are particularly one type or another. Some have a mix of levels, which means they focus on the overall girl and yeshivish level rather than high school grades and GPAs, and this has its benefits as well.
There are some things that can only be done with larger seminaries and some only with smaller ones. Its like the shidduch process but there are so many out there that you can find the one that fits your daughter best. Maybe tell us more info about the place you are dreaming of and we can tell you better fits.