SafeCig prefilled carto at 18 mg of Classic Tobacco. Did it taste the best? Absolutely not. But, considering that was 3 years ago and it was my first, for the sake of opening the door, I'll say it was the best! Anything that wasn't bad enough to turn me off and send me back to smoking is the best!
The first eliquid that made me fall flat on my face with its goodness was BWB RY4. That was the first flavor that let me know the possibilities of eliquid, and more specifically, natural tobacco liquid.
To answer you specific question, though I don't know if you'll dig these:
Ahlusion - Blue Grass Burley, Smooth Criminal, W&A Sasparilla (<---is almost too good to recommend! LOL)
GoodeJuice - Patriot, Fire Cured, Vita Bella
Heather's Heavely Vapes: Gandalf, Huntsman, and Dragon's Fire
NiteLiteVapor: Gold, Bounty Hunter (only recently have I accepted BH into the fold)
Mom and Pop Vapor Shop - Tobacco Haze
Backwoods Brew - 555 Exotic
This list is kinda goofy because I don't think in terms of top liquids per se, but these are some liquids that have withstood the test of time, for me, in terms of flavor. Are there more on my list? Hell yeah!