I have the Galaxy 2 and all my co-workers have Iphone4/4s
I prefer my phone
1) screen size. It's amazing. I bought a case with a kickstand and I can watch movies on it.
2) data. They are always struggling with importing and moving pictures. Running out of space, etc.
3) you can customize your phone with packages like Ice Cream sandwich and get the best of both worlds (Android phone with Iphone features)
Honestly, I think it comes down to personal preference. It's like Crocheting and Knitting. Which ever you learned first is the one that you think is the easiest.