Sony Xperia XA Ultra vs Xiaomi Mi5
Sony Xperia XA Ultra
The XA Ultra is a larger version of the Xperia XA, having a relatively similar design - including an edge-to-edge display. Of course, since this is a bigger device, the display is also bigger than on the regular XA: it's a 6-inch panel with 1080 x 1920 pixels. One of the highlight features of the Sony Xperia XA Ultra is its 16 MP front-facing camera with LED flash and OIS (optical image stabilization), which should let you take high quality selfies. The handset also packs a 21.5 MP rear camera, but it seems that this one doesn't have OIS.

Xiaomi Mi 5
The compact, premium Xiaomi Mi 5 is the best value-for-money exchange you can do for a phone equipped with the blazing Snapdragon 820 chipset. It's tapered back is easy on the eye and the palm, and Xiaomi has placed all the bells and whistles of a modern-day flagship inside, such as optical stabilization, a 4 GB RAM version, or a large battery, eschewing only a 2K resolution for a 1080p one, though at 5.15" the perceived difference would be negligible anyway.