I'm not a HUGE fan but its nice to have choices. MIUI seems too iPhone-y to me. Although the newest version (6?) I've heard, fixed that and made it WAY more customizable.
I like the WinMo option the best because of the integration with ms games and office365 etc. If I could dual boot anything it would be WinMo and android. I did that for YEARS with my titan. WinMo for work, android for home. It was awesome.
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