HTC's latest flagship device, the One M8, is one of the best Android smartphones now available on the market, but what would happen to it if Google stripped the phone of some of its customizations? That's essentially what the Google Play edition of the new One offers. Plunk down $699 and you'll have access to an unlocked and (mostly) unadulterated version of the M8 with stock Android 4.4 (also known as KitKat).
While the market will deem the Galaxy S5 the best Android flagship of the current crop of phones, I personally think it's this one. However, if the major Chinese manufacturers manage to get Google Play editions, I honestly would see no reason for anyone to avoid them. Chinese OEMs like Oppo offer the same (or better) specifications, have top-notch build quality, and usually sport great community support - but at half the price.