To give a practical understanding of medicaid HMO
Fidelis = verizon
Empire/healthfirst = ATT
Metroplus & affinity = t mobile
UHC = sprint
You are comparing apples and oranges. Cellular networks all provide the same thing: phone and internet service. Some have better/faster service, others have poor/slower service.
Healthcare does not work this way. There are thousands of different medical needs and prescriptions. UHC might still outrank all the others in terms of prescriptions, but falls short on doctor compensation for certain visits. Fidelis might be great at doctor compensation, but terrible when it comes to specialized procedures or prescriptions.
UHC is a monster and has a monopoly on certain medical devices and prescriptions. They have exclusive deals with various pharma companies. You might be able to get those medical devices with Fidelis, but not without a long drawn out battle of at least six months to a year.