Seriously. You couldn't Google and find an android handset with 2gb ram and a 1.6ghz CPU for under £300.
The moto G5 has 4gb ram and a faster CPU for under £200. The E4 is under £100 and has similar spec to the 6s. The Oneplus 3T is half the price of the iPhone.
I'm well aware the spec sheet only tells half the story and iOS works so well because it's designed to work perfectly with the hardware.
But let's not lie and say Apple would win if the competition was strictly spec sheet based.
I like the Moto G line and I think they're excellent value for money. However, on paper is pretty much how they beat the A9.
It's like the Intel dual-core and AMD quad-core comparisons from a few years back (probably now, too, I haven't really followed x86 CPU progress past Haswell). AMD wins multi-core benchmarks due to having more cores but regular computing, Intel feels (and is) faster because a lot of tasks are limited by single thread performance. Intel just had significantly better IPC.
The disparity in single-core performance here is between something like Intel Atom netbook and 2013 MacBook Air. Or like iPhone 5/iPad 4 and iPhone 6s.