Today was a good comparison of the two varieties.
The Trinity plants were much taller, more than 6 foot. The Early Sunglow plants were only about 3 or 4 foot tall.
Trinity made a much, much larger ear. With larger kernels.
Flavor-wise, I think the Early Sunglow has a slightly richer, sweet-corn flavor, and the Trinity is sweeter.
They were grown on opposite sides of the yard. There might have been a soil difference. I planted the Early Sunglow about 2 weeks earlier than the Trinity. The Trinity is just beginning to bear. Early Sunglow is done. Only a few ears developed on the Early Sunglow plants. Each and every Trinity plant has an ear. Some have two.
If I didn't have them here to taste side by side, I would think the Trinity is as good as the Early Sunglow. Given the big difference in yield, Trinity looks like the more preferred variety by far. The flavor difference is too subtle to matter.
This difference might just be in my yard, or might be that the soil was not good in the location for Early Sunglow. It might be worth a try in a different spot next year.