You're kidding right? I mean this is an Android forum and you haven't read enough to see the clear difference?
Ok just in case you are serious, here are a few highlights:
1. Better network. Yes AT&T is faster in some areas, but overall VZW has better 3G coverage and is more reliable.
2. The Incredible is customizable. There is very little you can't change about the Incredible from the wallpaper to the widgets, the the alternate keyboards, home screens, and dialer, etc With Root, you can now even load custom ROM's on it. Even if you Jailbreak an iPhone even you don't have that much customization.
3. Google Voice works seamlessly (lower carrier bills) and is not even allowed on iPhone
4. Flash, weather you love it or hate it, tons of the web still users it and will for a good long time. Incredible will get it (when Froyo launches later this year) and iPhone will never have it.
5. Better radio. iPhone is well known to have one of the worst radios in any cel phone, while I have yet to see any specific study of the Incredible I can tell you that phone works in many places my BlackBerriers and LG phones don't.
6 Browse Alternatives. I actually think the Incredible browser (which is NOT stock Android) is better than Mobile Safari. It's faster and automatically re-sizes and wraps text. Mobile Safari does not do that at least not as well. If you don't like the browser you can get others: Opera Mini, Dolphin, Skyfire, etc. iPhone has Safari and now Opera Mini but they had to jump through major hoops to get that.
7. Side Loaded Apps, without rooting/jail-breaking/rooting.
8 Removable/swappable battery
9. Infinitely Expandable memory with MicroSD cards (32GB at a time but nothing saying you cant have more than 1 card)
10. Does not require iTunes. With the Incredible can use other programs to load your music and other media, you can buy music from Amazon or somewhere other than iTunes right from the phone. Upgrades are OTA, and do not require a computer program at all.
I could probably go on but you get the idea.