I give grapes two thumbs up. For well over one month now I have been eating fresh grapes. My two concord grape vines have supplied all the grapes I wanted to eat, plus enough for 10 gallon of grapes made into juice, etc..I probably have a hundred or so grapes left on the vine. I know of no better fresh food that taste great anytime of the day or night raw/fresh picked off the vine and swallowed skin/seed/all.
They needed practically no care. They are above the weeds. While I love raspberries, they are down with the weeds and are harmed by cold snaps and dry periods of weather. The grape on the other hand has supplied free food year after year and gets better with age.
I am totally sold on grapes and plan on planting more. Grapes and raspberries both love the Black-Walnut tree and that is sign enough that they are good in my book. Being deep dark purple is the premium color for healthy fruits and no doubt high in potassium and natural iodine.
This fall I will be converting the garden into grapes and will still struggle with the weed problems that comes with growing tame raspberries.