I have Mi Max 2 and it is 13 months old. It has high gaming performance with 4GB RAM and 5300 mAh battery. Even today it doesn't have any bad review. I love this phone
Xiaomi Mi Max 2 vs Honor 6X
Both the phones have their pros and cons lets analyze both:-
Advantages of Mi Max 2
1.More RAM:-More RAM means more applications can run at the same time,
2.Bigger Screen:-. Reading, browsing internet and watching movies is more pleasing experience on a bigger screen.
3.Slimmer:-Slimmer devices are easier to carry in pocket.
4.More Storage Capacity:-More memory allows you to store more songs, videos, photos and install more applications.
5.Bigger Battery:-It can generally last more time,
Advantages of Huawei Honor 6x
1.Light Weight:-Light weight devices are easier to hold.
2.Has Dual Camera:-Dual camera is useful in enhancing certain effects like blur, zoom and wide angle photos.
Verdict - In my opinion, Mi Max 2 is better overall performance and price ,if you need light and dual camera handset you can go for Huawei Honor 6x
You can also compare these devices on 91mobiles