1. As a noun:
* "too": This is the most common pronunciation, rhyming with "shoe" or "blue". This is how you would pronounce it when referring to the brand "Tous".
2. As a verb:
* "too": This is the pronunciation when "tous" is the masculine plural form of the verb "touser" (meaning "to cough").
3. In some regional dialects:
* "to": In some French regions, the "s" might be silent.
To sum up:
Unless you are specifically dealing with the regional pronunciation where the "s" is silent, "too" is the most common and correct pronunciation of "tous" in most cases.