G3 Dual Sim is better in my view. 1) G3 supports TD and FD LTE, also WCDMA and TDSCDMA, Mate 7 doesn't do that as far as i can tell. 2) G3 Hong Kong ROM has google embedded and have ongoing software support. Huawei needs rooting and flashing custom ROMs. This might be a small thing, but I personally don't like keep reflashing Roms after initial setup. 3) G3 s size is better. it's about the same size as HTC One M8 and easy to hold. 4) G3 has 2K screen (1440 x 2560), Mate 7 is full HD (1080 x 1920), don't trust anyone who says it doesn't make much difference. the extra PPI definitely makes a lot of difference in subtle way.