I use Advisor, Consultant or Coach because they focus more on what I do instead of the position in my company. Having my own company both with contractors and solo using those other titles don't help when I am looking to work with people. I have used founder when dealing with investors or bringing on a possible partner, but only those circumstances. For me the "title" I use embraces what I believe in, which is working with people or guiding them. I hope that helps. :)