UC has two browsers. Mini is the one with less size and data usage. But it lacks heavy weight software like HTML5, flash.
Pros
Small
Data compression
Many nifty features, compared to’complete browsers’ like Opera
Cons
Page rendering is often problematic.
According to the battery management app, UC draws a lot of power, especially in the background.
Compared to dolphin, this better. But in terms of stripped down performance, opera mini used to be better.