Side By Side Comparison of Oppo U3 and Sony Xperia M4 Aqua Dual. Compare Processor, display, RAM, Storage and other features here. You can quickly compare Oppo U3 and Sony Xperia M4 Aqua Dual smartphones just by looking at their ratings and results showing "winner" and "runner up." There is also a short analysis comparing different features of Oppo U3 and . You can also look at each hardware feature individually to perform your analysis while comparing mobile phones.