C.H.
Learning disabilities aside, I can't think of any reason to send a child to any form of pre-school, pre-K, daycare unless the parent isn't home during the day. It's pretty easy to teach a kid numbers and colors and weather and stuff. When I worked and sent my first child to these programs, I was definitely duped into thinking that there would be some kind of advantage to searching out the right program. But many friends and I eventually figured out that it was all really daycare, so we stopped sending our kids. (Many of them were smart enough to never send them at all, but I was still working at the time and wasn't ready to face the idea of quitting. Quitting work for the kids was as difficult for me as quitting an addiction.)
I taught them to read at ages 3, 4 and 5, but you don't have to teach a child to read prior to kindergarten unless they're ready.
So I would say don't spend too much time analyzing these different programs, unless of course, your child has special needs. Just find a pleasant place for your child to enjoy his day.