Going directly at a billion dollar competitor

Has anyone marketed by going directly at the biggest players in their space?We are a local/ regional company. I want to name the two largest companies in our space by name in an upcoming marketing campaign. I want to speak directly to their users and why they should leave and come to us.We are a rounding error for these companies. I know we won't get on their radar nationally but they do have a local office. I am a little hesitant to call them out directly in our marketing so that they don't start targeting our accounts even harder.I have seen someone in our space do it well once before but they were larger than we are and had more sales reps on the streets.Any feedback or ideas are appreciated! see hubwealthy.com/wealthy