It's important to note that:
* Twi is not a single language, but a dialect cluster within the Akan language family.
* The Ashanti are a major ethnic group within the Akan people, and they use a particular dialect of Twi known as Akuapem Twi.
* Other Akan groups, like the Fante, also speak Twi, but their dialects differ from Akuapem Twi.
So while "Twi" is the most accurate answer, specifying "Akuapem Twi" provides a more precise understanding of the language spoken by the Ashanti people.