Do siblings get adopted together easier than a mom and baby?

Simply that. If you have a bonded pair of siblings; is that better than having a mom and older kitten together?

Only looking for opinions. I was curious what experienced fosters had to say. Thanks for taking the time.

EDIT: thank you all for your input. I feel less irrational in my thought process. The ”twins” have been passed on 3x already. They do everything together from sleeping, eating, and drinking; all the way to grooming, and using the litter box. I’m going to keep tying to advocate for them to stay together. I do get scared they’ll be separated after I surrender them.