My Ison's black muscadine is going well and is ripe right now. It is picked when dead black, not purple. Ison nursery is in Georgia and this must be a favorite they developed. This late in the year Ison tastes better than my backyard mangoes such as my Kent, Keitt, Gold Nugget fruits still hanging in there on the tree at this late date. The Ison potted vines are available locally (PM me if interested)
Tari's burgundy grape gets good reviews as a half northern and half muscadine cultivar. I bought one in 3 gallon today at
Bender's Grove. Mike Bender told me Pine Island is now culturing them, a new thing for them. Mike also told me he would soon (4 weeks) have Noble muscadine potted vines too via Pine Island.
Muscadine grapes don't get enough respect here (forum) or in south Florida