Z10 or S3?

Ive been waiting for the Z10 to come out for a while now and now that it's finally here, I find myself wondering if I really want it. Main reasons I wanted to stay with Blackberry is because I use bbm for my best friend and my mom, but my friend just bought the S3 yesterday and loves it. My mom is thinking about switching to Android as well. So there goes that reason. Other reason is I don't want to lose my unlimited data plan that I'm grandfathered into, and I know I'll have to give it up if I switch to Android.

What will I be able to do on the Z10 that I won't be able to do on the S3? Anyone make the switch from Android to the Z10?

Thanks in advance!

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