I am now one week into the iPhone 4 coming from the HTC Droid Incredible.
I started a comparison thread of these two phones in a thread over on AndroidCentral. I'll summarize below the main points that I and some others have made, or check the full thread here:
BB 9550 --> DInc --> VZiP4...? - Android Forums
iPhone 4 advantages...:
- Battery Life (but when it runs out, you can't swap in another)
- Physical Design
- Video Calling
- OS and GUI run smooth as silk
- Keyboard
- *Current* availability/selection of Apps (App Store has the most)
- Voicemail: *Only* Verizon phone that plays ONLY what you record in your greeting, without all the extra, standard Verizon greeting garbage
- Multi-tasking interface
DInc advantages...:
- Ability to swap in another battery (but you will need this because the battery life is terrible or -- with some tinkering -- barely adequate)
- Browser/Flash support = most complete web browsing experience
- Fast!!!
- Widgets
- Quality of Apps, especially those made by Google (Maps on DInc smokes Maps on the iPhone 4, plus integration with the Navigation App that gives real-time, turn-by-turn directions)
- *Future* availability/selection of Apps (Android Market will overtake App Store at it's current rate of growth)
- Notification Light!
- Customization - in EVERY sense. (Really, Apple? Just one tone for e-mail???)
- Screen/Display (AMOLED on mine - I know a lot of people say the iPhone 4's screen is unbeatable but my DInc's AMOLED screen is the clear winner for me when I hold them side-by-side)
I still haven't decided whether I will keep my iPhone 4 or return it within my 14 day window and either go back to the DInc or pick up the Thunderbolt.
Definitely, the iPhone 4 is a georgeous device and overall a great, smooth user experience but there are many things the DInc does better and the things I use it for it does faster than the iPhone 4.
At the end of the day, your best bet is to get your hands on one and try it out. You get 14 days to return it if you don't like it.
Right now I'm leaning towards going back to my DInc or checking the Thunderbolt, but I'm taking the full 14 days to decide and still have a week to go. The overall experience of the iPhone 4 definitely continues to grow on me, so we'll see...
Hope this helps!