Shrinkrap, if your Salad leaf is the one which is a milder Genovese flavor, just use more of it, Caprese salad, pesto etc. Thai is not just good for that cuisine, flavoring coconut milk and curries, it adds a pleasant anise-like flavor to pesto, anywhere that flavor is welcome; maybe some shredded on top of a slice of pizza!
Opal basil, unfortunately, turns black in many dishes. It can make a lovely herb vinegar to use in salad dressings. That’s what I used it for. In fact, all the basils make useful vinegars. Some are great additions to chili, soups and stews. Once you have a variety of herb vinegars at your fingertips, you can experiment with blending them, a teaspoon of this, plus a spoon of that…
Cinnamon basil is getting harder to find, good for you! Think middle eastern cuisine, maybe a small bit in mole. It’s been over 30 years since I’ve grown that one.
A word of warning: Not many years ago, a new (to the USA) basil disease was imported, Basil Downy Mildew. I believe it came in on dried Ugandan basil and has spread across the country. The spores blow on the wind and travel great distances. It kills all the varieties very quickly, unless they were bred to be resistant to the disease. It has been reported in every state and many countries.
Early symptoms are yellowing leaves with grey spots and patches on the leaf undersides. Rapidly, the whole plant defoliates and dies. I was astonished how quickly this happened when I first saw it. If it attacks, best to harvest all the basil you can before it wipes out all your plants.
I’m growing Thai and Prospera, a variety that is supposedly resistant to the disease.
Basils outcross like mad. If you want to save seed, you need to cover the unopened flowers with insect-proof netting and carefully hand pollinate. It’s often easier to cover the whole plant with netting.