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Android right now reminds me of the days when I built my own computers....constantly tweaking and upgrading. I decided that was not a good thing on a phone. I just want it to work, every time. Most people don't want to think about the OS of the device, they just want to use it.
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Exactly why I got the EVO!
I'm running nightly builds of new versions of Android compiled from source. I'm a tweaker.
That said... I'd say both platforms are fantastic! One of the things that attracted me to the iPhone was the hacking community, and it still is pretty large. The EVO has a great one as well, so that's cool too.
You really can't go wrong with either Phone in my opinion. What it came down to for me was that I was bored of iOS, wanted to switch to Sprint (cheaper for me), and wanted a bigger screen (EVO screen still has really great DPI)