If you have money, what would you choose and why?
From my point of view Android is the correct answer.
Why? Because Nokia with Symbian is out-dated even if they release the Symbian^3 is still way back of its competitors and they refuse to use Android. Rumors say that it might use in the future WP7, but until we see actual product or announcement it will be a long time.
About iOS, I have to say that they are too obsessed to control everything and that all the products are looking the same, nothing different as UI. Whats the point of having a device that you can’t customise how you want? Almost same UI with 1st gen iPhone. And come one…Apple is giving hackers because they jailbreak the gadgets? Why? Fix your damn bugs in software and make it impossible to break..is it so hard?
And about WP7 I think the UI is to simple, but I don’t know too much about WP7 so i cant say too much.
I want to say in the end that Android is a very good platform and i belive it will become better with time, even it has fragmentation problems, but this is only because of mobile phone companies like Samsung, LG, HTC , and others, because they lose interest in phones that they release 2 months ago and don’t give updates to them.
ps: I want to thank Microsoft for rewarding jailbreakers for their knowledge.