Don't think you can compare those two, as they are different things. Even if Cloudflare "relies more on their own infrastructure", they still have to have peering agreements with others, otherwise they can't accept/send traffic.
More likely, Netflix has better infrastructure and better peering agreements, than Cloudflare. Which is kind of surprising, since Netflix is supposedly a media company and Cloudflare is a "internet" company.
Netflix has an advantage: their OCA boxes may handle speed test traffic [1]. That means a box racked at your ISP[2] may be serving that traffic. While Cloudflare may have nice peering agreements, they don't have that.
How does that explain me getting solid results from DSL Reports, Ookla to a random server I picked in Ashburn, and to Google Fiber's servers in Atlanta, Charlotte, and locally.
I think there's something about the methodology of Cloudflare's test.
My point is limited to "fast.com could give faster results because you may not even leave your ISP to talk to them"; I'm not here to say "Cloudflare's results are good/bad/better/worse/reliable/unreliable."
A thought, though: Cloudflare reports your p90 time as "your speed". I don't know what the other sites report. Is it the same?
More likely, Netflix has better infrastructure and better peering agreements, than Cloudflare. Which is kind of surprising, since Netflix is supposedly a media company and Cloudflare is a "internet" company.