Is oppoa2 better or oppoa8 better?

In terms of hardware configuration, the screen size of OPPOA8 is larger, with a 6.5-inch TFT-LCD screen. The A8 is equipped with MediaTek MT6765V/CB eight nuclear processor, and its performance will be improved to some extent. In terms of photography function, the A8 rear three cameras include12 million+2 million pixels, which supports multiple camera modes. The front camera has 8 million pixels.