Both great phones. It's easier to recommend the G2 since its smaller (although a big phone itself).
But it comes down to preference and some compromise. The G2 is excellent, has great battery life, has a great display, has a great camera with OIS, is easier to handle with one hand, has more development, is cheaper.
The Flex is more stylish (in my opinion), has a better battery life, has a curved display, shoots 4k videos and has a self healing back.
On paper the G2 wins to be honest. But the G flex is great cause it is something different with its curved display, is a big phone for those who like big devices and has the best battery life of any phone. It's easier to dislike the G flex than disliking the G2 cause of the 720p and its big size. Me I prefer the G flex cause I love the curve. If this phone wasn't curvy I wouldn't even consider it.
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