One of the biggest signs of a fanboy is illogical arguments without base.
Please stop criticizing Android for releasing updates. They release them more often than Apple and I think they are more feature full. Come on, where you really impressed with MMS 2 years in? CCP was good, but another thing that could have been there had they taken the time to develop a proper OS.
The new feature of iOS4 would be great... if they worked well. I'm running the GM (for those that don't know, Gold Master is what a company decides is good enough for consumers and will release AS IS if no problems arise) and it is crap. I get emails and go to view them and the indicator is there but there are no unread emails. The To and From headers for threaded emails turn into random numbers. Usually 0 or some long number. From your Unified Inbox, there is no way to see what inbox an email came from without checking the address in the To line for yourself.
Folders, could have been good. They are slow as heck on an iPhone 3G. At least a full second delay between tapping them and them opening. And whats with holding only 12 items? I have more games then that. Now I have 4 Folders named Games.
I jailbroke it because Apple wanted to sell me a 3Gs instead of giving me "multitasking". I'll tell you what, this sucks. I haven't seen any apps that take advantage of the new APIs, but the "improved save state" is not improved. Every time I switch between apps using the launcher they totally boot up from the start again.
My point is... Yes, this is an improvement over OS3.x. The features are good to have and will likely be cleaned up eventually. Just claiming that Apple is better at it than Google is false. All software has bugs and there are always better ways to do things.
Things I like about the EVO more than the iPhone 4:
Sprint, I don't like the number of dropped calls I get with AT&T and the price I'm paying
Larger screen, I want to set the screen up on a stationary bike or treadmill and watch while I run. I also want to comfortably use it to write longer emails.
Android OS Updates, as I said they are the same quality but I get bored quickly and need updates to keep me entertained. I'll likely be rooted and update often.
4G, I live in DC and will have coverage. I realize this isn't for everyone.
Google Voice integration
Lastly, it's something different. I'm getting bored of the iPhone and iOS is still the same old.
Things I like about the iPhone 4 over the EVO:
The reviews about the screen make it sound AMAZING! It would really be something to have. I really do wish it was bigger too, then I think I'd probably stick with the iPhone.
App Store, I know the Android Market has most apps I want, but still not like the App Store. AM is a good replacement, but not the same.
Gyroscope could potentially lead to some cool games, but I don't see many other places for its implementation. Maybe I'll be surprised!
Other than that, the two phones are a wash to me.
As for Video Chat on both, FaceTime looks cool! Android already has a couple options for the EVO to use though and if/once Apple follows through with making FaceTime an open standard, I'm sure we'll see a version on Android that will even work with the iPhone. Much more likely than seeing an iPhone version that works with Android.
These are just my opinions anyway. It's going to be a preference thing. To be honest... I want BOTH!

That's why I'm happy that Apple has the iPod Touch. Hopefully the next version has the same screen as the iPhone 4.