Apple iPhone 4 or Motorola Atrix 4G?

I currently have the iPhone 3Gs using 4.3.2. I want an iPhone 4, but I can't help but notice the Atrix 4G. I love the iPhone because of how simple and powerful it is, but I'm good with computers and hacking stuff and the Atrix would be perfect in lines of customization. iOS is not very customizable at all, while the Atrix is. I think I am somewhat of an Apple fan boy. Their store is close to us so it's easy for me to get excellent customer service--very nice! But the Atrix has THE best specs for AT&T phones and I really would like it BUT what would there be on the iPhone that I'd miss? Also, iPhone 5? My upgrade is three days before my birthday, July 26, perfect timing. Help me out with comparing iOS with Android on the Atrix. Voice commands for music and dialing? Remote buttons on headphones? Camera quality? GUI lags? Battery? Memory? App availability? Just help me out here. I want the best for my money. Also, my iPhone has installous--all apps for free. Is there something similar for Android? Can I get free tethering on Atrix? Thanks a million!