They both look rather similar if you’re not a botanist: basil and oregano. I remember attending a cooking demonstration at a Greek Orthodox Church in Redondo Beach and being told by Pitsa Captain and Akrevoe Emmanouilides, the instructors, that in Greek cuisine the preferred spice was oregano. And that despite the fact that basil grew wild everywhere!
Although oregano is used in Italian cooking, the predominant flavor is of basil.
In point of fact, I love both herbs. And I have even been known to use both of them in the same dish, especially pizza.
I love using fresh basil in my Italian cooking, even though I have to pay a bundle each time I buy it. Some day, I will probably create my own little herb garden in a box that hangs from the iron railing on the back steps of my apartment.
As for oregano, I have only ever used it dry and have not encountered any recipes that call for the fresh herb. I wonder why.