Unlike at&t and late-to-the-party t-mobile, Sprint's plans to have the entirety of their network upgraded to LTE when they're done. That has to matter. Once they're done, the instances of fall back to 3G should be few and far between compared to most of their peers. Besides, what is the definition of inferior? If a Sprint device is pulling 10 Mbps and a VZW device is pulling down 12 Mbps, will most customers really notice or even care unless they're sitting around running speed tests all day with the two devices? Never mind the fact that Sprint has unlimited LTE data while at&t and VZW do not. That also has to matter.
This prediction by Muppet has about much legs as his Sprint bankruptcy prediction. I think he'll have to admit that he was wrong again.