If you were in support, you would know that users who are unhappy or encountering problems always turn to the seller, even if the seller can't do anything about it because they are selling or validating a product that should work. Our Oracle, Microsoft Office, Cisco, Zebra and many other users never turn to them but to my company, whereas our internal software is not in question. I would like to be in the case of Verizon and have the choice not to market a product knowing full well that I will have to deal with their crap.
I don't know the quality of the operators in your country, but if Verizon is better, ask yourself if the choice of devices it validates does not enter into this assessment.