This is from ID10-T on Reddit. I trust his judgment - Dave is a great mixer.
"There are so many grape flavors out there! Quick run down on the ones I've tried:
TFA Grape Juice. Weak. Tastes like a cross between watered-down store brand grape juice from concentrate and grape kool-aid. I think the best use I've ever seen of this flavor wasn't even as a grape, it was used to make CAP Sweet Strawberry into strawberry jam in this old
Flavor of the Week post
TFA Grape Candy. Tastes kinda like a grape lollipop with some of the plastic wrapper still stuck to it, weird plasticky note, but has been used to give other ingredients a jolly rancher vibe.
INW Grapes. The grandaddy of the grapes, the one that caused many of us, myself included, to become Grackheads. Like shoving a handful of mixed white and red grapes into your face. But not American table grapes, more like the thick-skinned grapes with seeds in them. Tannic, earthy, and a bit floral.
FW Grape Soda. So much sucralose, it's insane. Major coil gunker and tastes like diet grape soda. Probably pretty yummy if you're into that sort of thing but it actually gives me a headache."
FLV Grape. Delicious and 90% of the way to a perfect grape kool-aid or grape popsicle.
SC Grape. Mouthwatering grape candy; "the LA Watermelon of grapes."