Private School for Kindergarten?

I’m planning to send my son to a private school next year for kindergarten. After some research, I’ve narrowed down a few schools. I think an all-boys school could be a good fit for us, but it’s not a requirement. I don’t personally know anyone who attended these schools, so if your child goes there or if you went there yourself, I’d love to hear about your experience—the pros and cons. Thank you!