I read many answers here that the Hamburger button is bad as many people don't look there and don't end up using all the app's power.
However, can one use it as an index in addition to normal full page navigation?
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Pick one of the two options. Don't make a second menu that's exactly the same. People will be confused or annoyed if they discover the same menu after spending a mouse click on a hamburger menu.
So which one to choose?
Don't use a full page navigation, because mobile screens are small. A hamburger menu will do fine, because people can see it easily. I think people are getting used to the hamburger menu now, after 25 years. It's everywhere now.
Desktop / laptops
This is the place where hamburger menus are hard to see because they are small in comparison to the average monitor size.
This is an interesting A/B test, which concludes that the word "menu" with a border around it will work better than the hamburger menu: http://exisweb.net/mobile-menu-abtest It's something you could consider if your target audience isn't fully aware of the function of a hamburger menu (like the elderly).