I had a HTC Incredible for 14 months. Just "upgraded" to an iPhone 4S. After having it for two weeks, Droid >>>>>> iPhone. JMO
I once had an iphone, and when I called customer support with a variety of issues, they told me that Apple was more of a "computer" company and couldn't fix all the phone issues. So I called AT&T, and they blamed it on Apple. Couple that with all the restrictions of itunes and no flash, Droid was an easy choice. After using them both, I like the Droid better, but as others say it still comes down to preference. Each has its strengths.
The thing is most Droid users have never had an iPhone & don't have a clue. I know a few people that went with droid from iPhone & every single one hate it & end up going back to iPhone. There are always gonna be those anti-Apple folks that won't admit iPhone is the best no matter what.
I had an iPhone for nearly a year and a half (3GS then 4), now have a Samsung Incite with Droid OS and think the Droid is completely superior. Internet capabilities, applications, OS configuration, you name it and Droid does it better.
It comes down to this: If you're lazy and can't be bothered to fiddle around with your phone and want it to do everything for you in a slick package that anybody with room temperature IQ can figure out, then get an iPhone.
If you're the sort that's constantly tinkering and fiddling with settings or prefer the absolute best web capability out there, then Droid wins.