There is definitely a pecking order to network prioritization, but it varies. Pretty much anyone one a Verizon MVNO gets severely punished in my area. AT&T and T-Mobile MNVO users can barely tell most of the time. In other places, it is the the opposite. Feature-wise, you can generally find the features you are looking for these days. Other than 5G, there hasn't been much new feature wise from the industry in a few years anyway. My AT&T Prepaid service has every major feature available on to postpaid customers. I can even use AT&T Microcells with my phone.