If it wasn't for the Samsung ATIV 500T, I'd probably get the TF700 combo. It was between desktop productivity in tablet form vs entertainment tablet. I do wonder which is the better companion for photography, for example, would either candidate be good for tethering photos.
I just tinker with photos (mostly the kids and family) so I'm not that familiar with tethering sorry. I am absolutely amazed at the amount and quality of photo editing software on Android though. As I'm typing this it reminded me of another of my favorite things is that there is a row of hotkeys on the dock and one of them shuts off the touchpad so while you are typing your palms don't make it go bonkers and then you just press the button again to turn it back on.