I'll be completely honest here, i work for an AT&T corporate store and the droids are really taking off but it's gonna be some time before it's at the iphones level. I did some shopping around to see the competition and at one point was even gonna port over to the big V for the Droid X which is an awesome device in fact it's the only droid i would buy for my personal line. Our Samsung Galaxy S Captivate we could barely keep in stock they sell very VERY well, nice phone too bad it doesnt have a flash and some other things.
The main reason i was thinking of switching is Flash, as it stands right now most droids and even our Captivate can play flash and when the 2.2 update comes out it's gonna be even better for the droid phones.
At the end of the day though, i stayed with my 3GS at the time (just upgraded to the 4 couple days ago) because of a couple reasons tha'ts very important to me
-Ease of use meaning the UI and switching to something really quickly without going into many folder, lol anything that's remotely like WINDOWS MOBILE on a phone, bye BYE!!
-iTunes, i love itunes even though my friends call me a sucker for paying for everything i want it feels good to use such an easy interface.
-iphone's Screen shot feature (press home and sleep button same time etc) i use this ALOT!! I haven't seen this feature on other phones.
-Resale value, this is big one also the iphone has every other mobile device beat in that area from what i've seen.
PS the only single aspect i HATE that the iphone doesn't use is FLASH!!!!!