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Summary
The HTC One A9 is equipped with a faster processor Octa-core (4x1.5 GHz Cortex-A53 & 4x1.2 GHz Cortex-A53) in comparison with the HTC One M8s. This is an important difference between these models because powerful processor allows the owner to run a few apps at once.
The One M8s has better back camera specifications that makes it a better selection for photography enthusiasts. The HTC One M8s front camera specs are better than that of the HTC One A9: (5 megapixels and 2.8 aperture versus 4 megapixels and 2 aperture). If you like to make selfies then you have to keep in mind this advantage. The One M8s shoots videos with a higher resolution: FullHD vs [v_quality_name].
The One A9 device is easier to use as it has more portable dimensions than the HTC One M8s: 145.8 x 70.8 x 7.3 mm versus 146.4 x 70.6 x 9.6 mm. The HTC One A9 model weight 143g that is 17g lighter than the weight of the HTC One M8s.
The HTC One M8s has a better battery life as it is produced with 2840mah battery that is 690mah bigger than the HTC One A9 cell. That's mean this model will live longer without charging.
Taking into account the above differences the HTC One M8s is the best choice. Get the list of the best offers on Amazon.