I still have one day left to consider exchanging my nexus for an s3, but I don't want to miss out on jelly bean. Can this really be that much better than the nexus?
I sent my GS3 back. GNex on 4.1 being smoother than the GS3 and the locked bootloader made the decision for me (I'm assuming you're on VZW, if not then ignore).
I don't think there is a wrong choice though. GS3 is a beast and will, someday, have 4.1.