What will be the fastest way to get a visa, spouse visa or fiancé visa? How long will it take both process before they approved?

There are pros and cons to each option you mentioned, including those related to processing time. There really is no substitute for consulting with an immigration attorney who, after learning all of the relevant details about you and your fiance, could then advise about eligibilities, options and strategies and could offer legal representation in the often quite complex application process. Note that a properly completed and fully documented application package can avoid delays and even more harsh consequences regardless of which option is pursued.