For an old-fashioned tomato flavor, try one of the classic canning varieties such as Old Brooks or Bonny Best. Silvery Fir Tree (Russian, heirloom, attractive fern foliage) has tart fruit.
The extra-sweet modern corn varieties don't have the good old corn flavor I remember. The older sweet corn varieties are su (normal sugary) not se (sugary extender), sh2 (supersweet) or sy (synergistic). Kernels not as tender, doesn't stay as sweet as long when picked, but has the good old-fashioned corn flavor.
I’m eating corn on the cob I just bought at Trader Joes in northern VA. the corn is very sweet. I love it with butter salt & pepper & garlic.