Also, An iPhone 6S would be more reasonably compared to a Nexus 6P, not a Nexus 4.
The iPhone doesn't have a monopoly on quality,
The network coverage part of my comment was in reference to freedompop. Not sure who freedompop contracts with, but I went with T-Mobile because at the time they were much cheaper than Verizon. Their coverage is also much worse in my area.
> The iPhone doesn't have a monopoly on quality
I didn't claimed that it does. They were examples of devices I have direct experience with. The iPhone 5 was a similar generation to the Nexus 4 and Moto G and was a better (but more expensive) device. The Sony xperia devices similarly cost more than a Moto G, do they not? And you just wrote they have a suboptimal UI, so for someone who cares about that, that might rule out those devices.
My argument is not that iPhones are the only quality devices. It's that spending more usually gets you a better product, not just a more prestigious one.