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Summary
The HTC 10 runs a faster processor Quad-core (2x2.15 GHz Kryo & 2x1.6 GHz Kryo) in comparison with the HTC One A9. It is an important difference between these models because powerful processor allows you to perform multiple tasks easily.
The HTC 10 has better graphics processor Adreno 530 thanks to which the owner will be able to run more number of modern games.
The One A9 has better rear camera specifications which makes it a better selection for photo lovers. The HTC 10 shoots videos with a better resolution: 4K UHD vs FullHD.
The HTC 10 has 4K UHD (1440 x 2560 pixels) screen resolution with 564 ppi pixel density which is better than the HTC One A9 2K HD (1080 x 1920 pixels) screen resolution with 440 ppi pixel density. It makes this model a good choice for playing games. The One A9 device is easier to carry as it has more portable dimensions than the HTC 10: 145.8 x 70.8 x 7.3 mm versus 145.9 x 71.9 x 9 mm. The One A9 model weight 143g which is 18g lighter in compare with the weight of the 10.
The HTC 10 has a better battery life as it is equipped with 3000mah battery which is 850mah bigger compared to the One A9 cell. That's mean this phone will live longer without charging.
Considering the above differences the HTC 10 will be the best buy. Check the lowest price on Amazon.