[BreakR]

In the green side, we have...

Pros:
-Free & open source, you can change its code in any way you want
-XDA Developers. 'Nuff said
-Customizable to no end
-In an unimaginably high spectrum of devices

Cons:
-Can be laggy, specially with Honeycomb
-Manufacturers usually eff it up

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In the dark glass side, we have...

Pros:
-Shit-ton of apps
-Easy to use
-Most of the times, very smooth
-Better tablet apps

Cons:
-Apple makes sure that even after you bought your phone, it's still theirs. (i.e.: Keeps breaking jailbreak)
-No customization whatsoever without jailbreak, still limited with jailbreak
-Limited mod support (i.e.: No XDA)
-Boring. Face it.

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In the red side, we have...

Pros:
-Cool...ish...interface, I guess. (Although you can get Launcher 7 for Android)
-XBox connectivity
-Just as smooth as iOS

Cons:
-Just as locked up as iOS
-Not customizable at all
-Paid jailbreak
-No one uses it, very little apps
-Any phone running WP7 won't get WP8
-Outdated and limited hardware (will get better in WP8)
-Internet Explorer as default browser. Kill it with fire!

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For me, Android wins by a long shot.
But what do you think?

Also, tell me what you think should be added to the pros & cons list! Specially Windows Phone, I've barely used it. But hey, Barely anyone actually uses it.