I have an iPhone n I love it but it works best when compatible with Yr home computer. So if u have apple/mac at home it's your top choice.Plus their customer service at the apple stores are amazing. I dont have a Droid so I can't really compare it. Sorry hope that helps a bit.
I have an iPhone 4 and love it buy I am my answer will not be biased by that. It really depends on what u want to use the phone for. I have heard the the Droid X is great for business people who carry and edit their work files as well as supa easy to text with the keyboard on the phone. Droid X users say that they never want to answer the phone, just email and text bcuz it's so easy. Lol. On the other hand I love my iPhone because I can do the same things and play a lot of games, music, movies, etc. I can access and edit files that I use for school and work, search the web, use gps for driving, email and text with ease ( u just have to get used to the no-feel keyboard), take pics and video, etc, etc. I used to be an apple iphone hater but I don't want another type of phone now. Also I don't have mac/ apple computers and I have not had any issues with compatability. I hope this helps. ??