Android - no doubt about it.
1. Open Plattform
2. No SDK Ripoff Policy like with iOS Stuff
3. Free Distribution of your Coding on the Market or Outside of it... (The Outside of it is the interesting part here...)
4. Lots and lots of fanbased modifications to handcraft it to endusers likings... MIUI, CM7, etc.
5. Several Manufacturers to pick from, this competition allows endusers to pick a device they can actually AFFORD that actually does what they want (not some 800$ single-manufacturer bullshit like with Apple, and before someone tells me I got my iPhone for 0$ then that person plain and simple lies, there is always a contract with a devil bundled that rips you off your 800$ somewhere)
6. Java VM allows for X-Architecture Development, allowing manufacturers to use next-generation components way earlier than iOS as all they gotta do is port the Dalvik VM to the architecture... this is how we came to see several ARM-Arches aswell as MIPS-Arches being used in Android-Hardware
7. It's Linux-based and runs on a normal Linux-Architecture / Kernel on the bottom, allowing for several Chroot tricks to directly launch Desktop-Linux Applications
This list could go on and on... but you get my point I think. I'm still laughing every time some Apple Kiddy comes to me and wants me to open a Adhoc Network so they can SSH a file into their Phone because Apple decided to do some stupid USB Mass Storage Block...
Or when they cry because some Bluetooth Sound Adapter isn't working because it's not Apple certified... So much bollocks...
In the end, Open Plattforms will prevail simply because they ARE open. They are in a constant evolution and reviewing process, monitored and formed by thousands of people, while opening plattforms pose the risk of people easily finding flaws and exploits in them, those exploits are fixed just as fast as they are discovered... while on proprietary locked down plattforms... it's somewhat of a security by obscurity principal...
And well... we are on a mostly Sony-based HW forum here at Wololo's... we all know how security by obscurity turns out in the end... right Sony?