I bought the NX30 after picking up the 760 for my quadrocopter. I really like the camera except for the audio issue but I don’t need that for my quad.
I looked at the two and it comes down to the focus ring, eye cup and overall larger size. I will admit if I had the money I buy the bigger one as it gives you more manual control but the size of the 30 is hard to beat. just have to go into the menus to change knob settings.
I just shot a feature called risingfromashesthemovie.com with some shots on at the Olympics on the 760 and worked with Hollywood DI on the color. It blew my mind how well it projected. Amazing
If you can afford the bigger one I’d do it. If you want the size factor and don’t mind the menus, 30. Hope this helps. Cheers. T.