You’re not gonna find one. The only people who give a shit enough to do a speed test are the ones who already have a strong bias.
What I want to see is a test where they get 6 people. One half gets macs, one half gets pcs and they get to pick out their own computer using a set budget. In the mac half, there is one person who’s never seen or used a computer before, another person who is a a mac fanboy but has an average knowledge of computers, and then the third is a mac fanboy who knows every single last nook and cranny of the os and computer. Do the same with the pc half, but with Microsoft fanboys instead of mac fanboys. Then monitor them and record their experiences with their computers.