Redmi 2 1gb 2014811(wt88047) Vs Global



I have Redmi 2 1GB 2014811(wt88047) - HM2XWC
What better install for this phone?
Last 7.1.20 - Miui 8 or Last Global Miui 9 7.11.16?
The most important are the least problems, like the best range gsm / wcdma / lte and wifi, and reasonably well holding the battery. Of course, the system is as smooth as possible. What you already recommend permanently for this phone.