The build quality alone of the iPhone 4 is already a bullet point for me to buy it.
The 3GS I have is fantastic. The iPad I have is awesome. The iPhone has a better resolution screen and also the iPad's A4 processor, it's a win-win for everyone.
Show me a device that even compares to the iPhone 4's build quality? THERE IS NOTHING ON THE MARKET THAT has the same build quality like the iPhone 4. Front and rear glass that is so durable and virtually scratchproof.
I was so tempted to jump to Sprint after AT&T announced their June 7 raping plans. But I held off to see the new confirmed iPhone 4 because seriously, if the EVO 4G was so good, I'd be over on Sprint right now. I have seen the EVO 4G at the sprint store, played with it for about 5 minutes - and I can confirm without a doubt, I would not even give up my 3GS for that phone.
Sure the screen is gigantic - but too large - because it's just bulky and really not that great. It's plastic fantastic and I don't care about the specs because my 3GS "feels" so much more fluid and that EVO 4G has too many strange options that just feels like it's trying too hard to show off what it can do - and clearly, it doesn't do anything great; the iPhone really does everything great.
I don't think I can hang with android - it's seriously not that great and with the new iPhone 4, I will stick with AT&T but at least I will enjoy my expensive _ass phone.