What to choose: Android or Mac OS?

Hey guys,

for some time, I have been using a Samsung Intercept. It is running Android version 2.2, "Froyo". I have had it for about one year now. I am using Virgin Mobile prepaid service, which includes a 3G Internet connection. I am impressed by what a broad range of capabilities it has. I am able to manage all of my contacts, maintain a calendar, send and receive email, use instant messaging, browse the Internet and even look up maps in conjunction with GPS data. However, the phone has always come across to me as a bit sluggish. I would say that its most endearing feature is that it has a slide-out keyboard that makes typing rather comfortable.

I sense that it is time to upgrade my phone. However, I am not sure if I should stick with this operating system or opt for a iPhone 5 with the latest iOS, which I have also heard called the "Mac OS." Please correct me if that is not the correct terminology. I have heard about recent improvements to the hardware that is used in the iPhone series. However, it doesn't seem to me that the operating system has changed very much. By comparison, I have seen phones running the new "Ice Cream Sandwich" and "Jelly Bean" versions of Android and there seem to have been some huge advancements.

The primary tasks that I use my phone for are e-mail, light web browsing, instant messaging and getting driving directions. However, I would like to be able to watch Internet videos and do some light gaming. What are the pros and cons of a new iPhone versus a new Android device? A major concern of mine is how effective the iPhone OS' on-screen keyboard is. I much prefer a physical keyboard and wonder how easily I'll be able to adjust. Thank you for any advice.