I've had Palm Trios, Droids, and now have had my iPhone for several years. I liked them all - lots of pros and cons for each - the biggest reason I switched to my iPhone was the seamless sharing of data between my iPhone and my iMac. Data for me is king - if I didn't value the data on my phone then I'd just switch to a flip phone and be done with it. With the Droid and Trio, to synchronize my calendar, contacts, notes, etc., I had at times 3 or 4 different apps on my Mac and was using a kludge with a gmail calendar, etc. and I was still getting odd errors with duplicate calendar entries.
I have 3 Apple devices now, iPhone, iPad and iMac - I add a contact on any one of them and it's synchronized with the others almost instantaneously. Calendar entries function the same way. That functionality will keep me an Apple customer. Note that when I was a Windows user, I had similar problems syncing my Trio and Droid.
My $0.02