Because I was looking at the specific synthetic benchmarks that I thought would most reflect gaming performance and general laptop use - namely, the PC Mark benches (which favor Intel according to the article) and the 3 tests under Content Creation (as well as the compression tests, which yes the A10 lacks in). In those tests, where the A10 isn't better or similarly performing, it's not too terribly far behind (usually).
Feel free to make a final decision including those other tests - don't let me stop you. I'm just evaluating it based on my experiences (which are different than yours, no doubt). Synthetic benchmarks are never the best indicator of real performance, either (and Sandra seems notorious for being innacurate; it feels like that's mentioned every time it's used) - so take those with a grain of salt.
If you feel the i5 would better suit your needs, or if others come in here and say I'm an idiot and the i5's better, then go for it. Your best bet with advice from others (like myself) is to not trust it, research, and come to your own conclusion. You'll be much more confident about your decision in the end, since it was you that made it.