i have had the iphone since it launched , going to a 3GS then a 4.
Now im using a Samsung Galaxy SII.
things ive noticed,
iOS is SUPURB, but the hardware, specifically the battery life, is AWFUL, i love that apple polices its app store to some degree, and because the hardware variation is kept to a minium, developers always know an app they create has only 2 or at worst 3 platforms to deal with.
Andorid is fragmented, clunky and has no common "theme" or "feel" of use between its apps, where the iOS experience is one of an "intergrated, seamless experience" the Android one reminds me of the dark DOS days of having every application on my pc use a different interface and control method. Even the inbuilt "STOCK" apps for email and texting on android devices feel like nasty freeware compared to the slick presentation and implementation on the iPhone
However
until Apple stop trying to aim for the "lightest, thinnest" badge at the expensie of battery life, i wont be going back,
if the iPhone 4 had been a little thicker, and they had increased the battery size by 50%, i would have stayed with iOS as my mobile phone of choice, as it is, having a phone that still has 30% charge after 10 hours is preferable to being in the apple ecosystem.
I have an iPAD for my iOS consumption, and i now feel, a proper phone, as my phone.