The question "What is best, conventional or non-conventional?" is a bit like asking "What is best, red or blue?" It depends entirely on the context!

Here's why:

* "Conventional" and "non-conventional" are relative terms. They describe something in relation to a specific standard or norm.

* What's "conventional" in one context might be "non-conventional" in another. For example, a traditional wedding is conventional, but a destination wedding on a mountaintop is non-conventional.

* "Best" is subjective. What one person considers best might be undesirable for another.

To answer your question, you need to tell me what you're asking about! For example, you could ask:

* "What is the best type of energy production, conventional or non-conventional?"

* "Is a conventional education better than a non-conventional one?"

* "Is it better to eat conventionally or non-conventionally?"

Once you tell me what you're interested in, I can give you a more helpful and contextually relevant answer.