Re: This Or Galaxy Nexus?????
Better camera, uSD card, better battery life w/ LTE modem integrated in the soc, bigger screen, physical home button to wake the phone from the front, future global phone support promised....
These are the main features that make this a no-brainer for me. If they sound appealing to you too, then go for the GSIII. Otherwise, the stock OS of the Nexus may be a better choice for you.
As for touchwiz, I plan to install Go Launcher and move on. Even with touchwiz running silently in the background it will fly, and still have more memory available for use than the Nexus does.
-Suntan