Here's my reasons for me:
#1 - Simplify Media - Not available on any other platform, and the developers say they have zero plans of doing so.
#2 - Touch screen interface - Accuracy, typing (for me I can hit 40-50wpm on a good day!!), and pinch/swipe guestures just can't be beat
#3 - Web browser - Pinch to zoom especially awesome, but the way pages are rendered are just amazing - AND the best part is that many sites now have an iphone version with iphone looking buttons and controls.
#4 - Best in class Exchange integration - only the Blackberry does a better job. I can look up contacts from the GAL. I couldn't do that on the DROID. Also remote wipe - not possible on the droid (yet!).
#5 - Ecosystem ... That's kind of subjective, but I already have a ton of chargers and accessories that work across all my apple ipod, iphone, etc devices
#6 - Vibrate switch - yeah, such a simple thing that makes life so much easier especially when you go to a movie or a meeting and realize you forgot to silence your phone.
As for the droid.. What rocks
-Facebook Integration - I'm sure Apple will do this soon - it only makes sense
-Task Manager/Notifications - This is the best thing about the droid - sorry Apple you need to get with the program
-Sound quality - superior on the droid, I have Mark Levinson audio in my car, and on streaming stations (the same ones I listen to on my iphone) the bass is depeer, and the highs clearer - and even the built in speaker sounds better then the one on the iphone
-Widgets - Come on Apple - give us the ability to have a button right on our home screen to turn off wifi or 3g without having to jailbreak our phones.
-Micro SD Card - Easy to copy all your favorite music and just rock out - NO messing with itunes, syncing, being tied down to one computer
-Turn by Turn GPS - never tried it when I had my demo unit from Verizon, but it looked cool, nice to not have to pay $70 bucks for another app.
-Google Voice - come on Apple, get with the program...

Oh wait, maybe you need to tell AT&T to F**K off!

-SNOOZE button for Alarms - COME ON APPLE!!!