Actually the reason why Samsung tablets are outselling Apple tablets is because of better pricing.
Why buy basically the same tablet for a higher price?
That's the logic of 99% of consumers these days.
But... they're not outselling Apple tablets. That Q3 market share data shows Apple still outperforming Samsung by a wide margin, and that was in the quarter before the iPad Air / Retina iPad mini launched. This doesn't preclude Samsung closing the gap, but the odds weren't in its favour this holiday.
Also, "basically the same tablet" suggests you haven't been looking at the specs or reviews lately. The Tab 3 series reviewed poorly, and it didn't compete well against the previous-generation iPads; it certainly doesn't look good versus the Nexus 7, MeMo Pad HD 7 and other tablets that are either much faster for similar money or offer similar performance for less money. The latest iPads are unquestionably faster than Samsung's mobile tablets (including the Note series), and they usually have better displays, better build quality and better cameras.
As for the OnSwipe study, you can disregard it entirely. It's covering a too-small sample size and has questionable motives. OnSwipe is choosing the stats that will get sensationalist articles, not ones that present an accurate image of the market.