it is recommended to buy Heirloom Seeds
I tested heirloom sweetcorn vs. super-productive hybrid seeds as an experiment, once.
The hybrid was better in every way.
It's important that heirlooms exist and people work with it, but for good yields, I'll go with hybrids, if I can.
Thank you for your kind reply @felixxx .
Definitely worth experimenting the idea....I shall give it a go as well for my assortment of salad greens.