I find that group daycares tend to charge more, one in particular charges $60 for P/T in my area and they seem to have no problem filling the spots! I recently had an interview with parents who ended up registering with a group daycare. They were looking for care for when their son turned 12 months. The father commented that children would be exposed to more in a group daycare.
These type of daycares market themselves well but I don't think they're as great as they tend to portray.