My understanding of the VPK program is that it is a state-funded preschool program. Parents have the option of enrolling their children in a VPK program at either a public school, or they can apply for a voucher to send them at a VPK program at private school.
Alternatively, they can bypass the VPK system and enroll their child in a private-pay program. Some schools may offer both. A school like Goddard or Kindercare may have a VPK class and a private pay class. Your concern is that the two classes have a different curriculum. This doesn't surprise me, for a few different reasons.
1) As a state-funded program, the VPK curriculum is dictated by state standards and guidelines. The private pay program isn't bound by these requirements.
2) The amount that the State pays for a VPK student is most likely less than what private-pay parents pay. Therefore, the school has more funds available for the private-pay class and can offer additional enrichment programs.
But I don't think that VPK students receive a 'lesser' education. It's just different. In my experience with family in Florida, the parents who opted out of VPK program and enrolled their kids in private pay programs did so because they wanted their children to be able to qualify for private kindergarten programs with competitive admission processes. They wanted their kids to be prepared for kindergarten admission testing, and that required a more intensive preschool experience. But the family members that attended VPK programs were also extremely prepared for the kindergarten.
If you're trying to decide between the two programs, think about what kindergarten you're going to be enrolling your child in and then make your decision based on that.