* Sawubona: This is the most common and general greeting, meaning "Hello, I see you." It's used for almost any situation.
* Siyabona: This is a more formal greeting, meaning "We see you." It's used when addressing a group of people or someone you respect.
* Sanibona: This greeting is used when you are returning a greeting, meaning "We see you too." It's a polite response to "Sawubona" or "Siyabona."
Therefore, "Sawubona" is the most common and versatile way to say hello in Ndebele.