Is it worth upgrading to HTC One A9 from HTC One (M8)?

I like my m8 and have had it for a while now, I was thinking of getting an m9 but then the a9 came out. The screen resolution on the a9 looks better and also the camera too, I like the design, also I like the fact it comes with the latest Android 6.0 built in. Is this really an upgrade from the m8 though? I will lose power in the chipset, also the boomsound speakers, also on paper the m8 has better battery life than the a9. The m8 will upgrade to Marshmallow 6.0 in a few weeks aswell so which phone is really best?




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