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Summary
The Huawei P20 lite has more powerful GPU Mali-T830 MP2 thanks to which you will be able to play more number of modern games.
The P20 lite has 4K UHD (1080 x 2280 pixels) screen resolution with 431 ppi pixel density which is better in compare to the Oppo A8 2K HD (720 x 1600 pixels) screen resolution with 269 ppi pixel density. It makes this phone a right choice for playing games. The P20 lite device is easier to use as it has more portable dimensions in comparison to the A8: 148.6 x 71.2 x 7.4 mm versus 163.9 x 75.5 x 8.3 mm. The P20 lite model weight 145g which is 35g lighter in compare with the weight of the Oppo A8.
The A8 has a better battery life as it is equipped with 4230mah battery which is 1230mah bigger than the P20 lite cell. That's mean this model can be used for a longer time without charging.
Considering the above differences the Huawei P20 lite will be the best choice. Get the lowest price on Amazon.