Iphone
If you're struggling to decide which phone to get, then you're in a similar predicament that I was in not too long ago - the difference being, that I actually got to play around with each of these phones for a bit before actually deciding to stick with one.
Since the Samsung Galaxy S came out a few days before the iPhone 4, I decided to get it just to satisfy my gadget hunger. After playing around with the Galaxy S, I was quite impressed - the interface was real smooth, and transitioning through the different menues (desktops) was speedy - this is in comparison to my not so old old phone, the Nexus One.
This was the first and only app that I developed for the iPhone, in the hopes that I could get a better understanding of iPhone application development.
Why would I choose to do an app that retrieves the Google PageRank & Alexa Ranking? Well... why not? It's not like I was looking to make money out of it - I just wanted to develop something that allowed me to improve my iPhone SDK/Objective C/Cocoa skill base.