I have a problem with that test - it does not measure perceived accuracy.
They used a paint program to draw straight lines. While that is a good test of the accuracy of the physical device, is that really a good test of the perceived accuracy? The perceived accuracy is what matters to most people. The iPhone may be able to draw straighter lines, but if the Android device feels more responsive and feels more accurate, then that's the one that's more accurate. I guess its like comparing two toys - while one may be made of better materials, etc etc, if the other one is more fun, then people will gravitate to it.
As much as I hate it, being an audio guy myself, a system that delivers louder music with a more punchy bass is usually more appealing to people, though it makes my skin crawl when I think that using that system, you will never hear a piece of music the way the artist intended. I think its a similar thing here. If the android devices feel better, they will be more popular. That's it.