The rest is a battle of differences: the Galaxy S6 against the iPhone 6 is also a lot about Android vs iOS, a 16-megapixel camera versus an 8-megapixel one, an octa-core Samsung chip against a dual-core Apple SoC.
It’s also about TouchWiz, a skin that has traditionally been perceived as lagging in speed and often featuring gimmicky, rather than genuinely useful features. Well, it has also changed with a radical overhaul by Samsung, just to make things all the more interesting.