To my nose, Sungold foliage smells fruity, but S. habrochaites smells herbal. Carolyn - I have occasionally noticed Sungold plants that lack the typical smell, so maybe you were just unlucky in the plant you sniffed.
I ran across a website (I think it was a small Canadian seed company) that said that Gardener's Delight was one of the parents of Sungold. Unfortunately, I can't re-find the site, but I did find a site mentioning that Gardener's Delight is a parent of Sweet 100. Both of these would make sense, since Gardener's Delight is a very sweet cherry tomato with long trusses. It also cracks easily, like Sungold.
http://www.fedcoseeds.com/seeds/?item=4109
Fred