It's not my opinion. It's a fact. Proof is available by the coverage area map.
It's your opinion, and everyone is entitled to theirs as well. At my house, only Sprint works fully. (GSM phones get no reception, and Verizon can't maintain a call)
So, yeah. Feel free to compare coverage maps (or whatever), but for many other's actual practical use, one network may be better suited - coverage maps or otherwise.