Golden Bantam, Black Mexican are the best flavored (sweetness and tenderness) in my opinion of the open pollinated types. Shoepeg/Country Gentleman and Stowells Evergreen have stood the test of time. Once leading commercial varieties , they still have a following among home gardeners. Truckers Favorite is closer to field corn but still grown. Howling Mob is similar to Country Gentleman, not quite as large. Have not encountered Sunshine Sweet but have read the descriptors. It was developed by Yeager (North Dakota) as a short season corn. I have grown some of the Canadian V series like Polar V. Early but with little flavor. Still hold true with hybrids in the extra early class.
I always seem to go back to Country Gentleman. I've tried Golden Bantam. It was good, too. I guess, like wine, it is a matter of taste. I'll have to keep an eye open for Black Mexican. Kandy Korn did well for me last season, but I think it is a hybrid. Still, Country Gentleman was the star...I only grow a small, home garden, patch though. Don't know how it does for a market garden (larger fields).