Both camera shares same optical zoom range and also have minor difference in core specification, take a look at the table below…
Nikon COOLPIX P600 vs. Panasonic DMC-FZ70 Specification Comparison Table.
Aperture Range: Panasonic DMC-FZ70 compared with better aperture range compared to Nikon COOLPIX P600. Bright lenses help you to capture more light, sensor captures less noise during low-light condition, create more DOF, better colour and contrast reproduction.
Better low light performance – The Nikon COOLPIX P600 features more ISO range compared Panasonic DMC-FZ70, the ISO range of Nikon COOLPIX P600 is upto 12800, Panasonic DMC-FZ70 is limited to 6400 only. Hence you will get more clear images with Nikon COOLPIX P600 compared to Panasonic DMC-FZ70.
Better Shutter Range: Nikon COOLPIX P600 features better shutter range compared to Panasonic DMC-FZ70.
Top Continuous shooting speed: Panasonic DMC-FZ70 features fast shooting speed compared to Nikon COOLPIX P600.
Display: Nikon COOLPIX P600 features bigger and high resolution display compared to Panasonic DMC-FZ70.
Battery Life (CIPA): Panasonic DMC-FZ70 battery rating is 400 shots and other hand Nikon COOLPIX P600 330 shots. According to CIPA.
Dimensions: Nikon COOLPIX P600 is smaller than Panasonic DMC-FZ70; hence it is bit easy to travel with a smaller camera compared to a heavier one.
Weight: Nikon COOLPIX P600 is lightweight than Panasonic DMC-FZ70.
High ISO Test Between Nikon P600 vs. Panasonic FZ70
Verdict: The Nikon P600 features more ISO range (1 stop better) and on the other hand Panasonic FZ70 have bright aperture lens (1 stop better) than Nikon P600, so technically both will have almost same image quality under same lightning condition, you are free to choose any one of them.
Buy Nikon P600 from Amazon | Buy Panasonic FZ70 from Amazon