There are two types or corn: Sweet vs. cow/feed/field:
The difference between sweet corn and field corn
Popcorn needs water inside and fluffy starches to burst, so I assume most are sweet.
In popcorn there are mushroom vs. butterfly kernels:
Popcorn Buying Guide | Types of Popcorn
My favorite was the twice-popped left over from the bottom of the bag.
Steel pot, enough oil to cover bottom lightly, get sizzling hot first, add single layer of corn, cover, shake vigorously until most popped.
More chewy than fluffy but each mouthful lasts longer.