As far as the two specific certs that you’re asking about: From what I know, ISSA seems to get more detailed with the science component of nutrition while the Venice certification get a lot more into the business aspect of nutrition and even gives you tools to start your business.
So, the knowledge component looks as ISSA is the winner. I personally don’t understand why a person wants to build a business around nutrition coaching with merely a certification so that’s why I don’t see the point as much in the Venice certification.
I do believe that ISSA nutrition cert is much like Precision Nutrition, as they are both un-accredited and are open book tests.
If you’re already ISSA certified than I would run with ISSA, especially if you had a good experience the first time.
I do hope you know, at this point in time, that your profile looks spammish, with the hidden identity under “Mind Else” with no profile information. There’s nothing to hide on here, we’re all here to help.