Would you give up your GS3 for the Droid DNA? I currently have both devices, while both of them have their ups and downs I was just simply looking to get other opinions. I love both devices and jump back and forth between them, some things bug me about both like the lag on the HTC keyboard or the service issues I had with the S3. Let me know your opinion.
I have the GS3 and my older brother has the DNA, so I've played with it a little. It is a little faster in everyday use but not by a wide margin. In my opinion the camera's are comparable. The screen on the DNA is quite a bit better than the GS3. I'm not sure what size you prefer but the DNA is a little bigger, but not by much and it still feels good to me. I'm not sure if Sense/Touchwiz come into play with your descision but if you've used previous versions of Sense 2.1-3.5, and you liked those, then you'll love the version the DNA comes with, although I'm not sure how i'll feel when they update the DNA with Blinkfeed.
In my opinion, since the DNA is an incremental improvement to the GS3, and the GS4 is so close to being released, I would wait and just get that (qualcom 600, bunch of software updates, and it'll have almost the same size screen as the DNA). By then the one will be out as well and if you don't like the GS4 and still want to go the HTC rout, you'll be able to get the ONE.
It goes without saying though, that you have to ultimately get what you want to get and what works best for you.
Good luck