Samsung Focus vs. iPhone 3G S?

I'm torn between the two phones. I'm planning tp stick with AT&T because I have a 20% discount off my plan with them. Both phones are 50$ upgrades. I'm an app user I admit and I spend Anglos amount of my life playing things like angry birds and gun apps and red button. But I also spend a considerable amount of time browsing the internet. So between whcih one would you recommend for me? Its basically between apps and a strong processor.