To answer your question:
I can't speak for ALL of us, but here's the primary reason why I prefer Android over iPhone:
Apple controls every aspect of the iPhone's environment. From the operating system to the apps available, they approve of everything. That makes it a great phone that WORKS... but it also limits customization, personalization and modification. Every iPhone basically looks and runs like every other iPhone. It's a walled garden... everything works, but it gets rather... boring.
Android is open-source. You can root it, overclock it, modify the guts of it, add apps that are off-market and truly make it a one-of-a-kind phone. If you get tired of the stock operating system, you can flash a custom ROM and completely change it out. I doubt anyone out there has a Droid that looks and works like mine does. It's the Wild West of cell phone tech: almost anything goes. That means the more you tinker and adjust, the more risk you run of messing something up... but that's half the challenge and fun (and why we have nandroid backups).
I hope that answered your question
