I agree, and this is why I have nothing but contempt for typical "best provider performance" conclusions that are driven solely by single-connection TCP transfer tests (e.g. speedtest.net).
In most cases, latency matters more than bandwidth (where bandwidth is roughly the same within an order of magnitude or so). This is why there's a very strong correlation between the provider that had the lowest measured latency and the provider that had the lowest page retrieval time. In the end, real-world page loading is precisely what we use smartphones for, and so we need to know how that application performs, instead of what raw transfer rates are.
I still think the Gizmodo tests are deficient, though, as they are unclear as to whether they repeated the tests at regular intervals over a 24-hour period. Network congestion varies throughout the day, and at any given moment one path may be more congested than another. A valid test, IMO, would take the average (or median) of each metric over a 24-hour period (or even longer, covering both a weekday and a weekend, since usage varies among them).