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I believe ISO is more common than NRG. There is more knowledge of ISO files than NRG files on the web. So if you needed help with NRG files, chances are you would get more help on ISO files rather than on NRG files. Both are compatible on Mac using a program like Toast.
 
I believe ISO is more common than NRG. There is more knowledge of ISO files than NRG files on the web. So if you needed help with NRG files, chances are you would get more help on ISO files rather than on NRG files. Both are compatible on Mac using a program like Toast.

give thanks for the quick response ill go with iso .
 
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