Depends what you want to do with your life -- sales will benefit both your options ("sales solve everything"):
(1) Consultant: flexible, focus on one skill, focus on diverse opportunities, no ownership of day-to-day grind, low excitement, limited upside (equity), low risk tolerance, limited energy required
(2) Co-Founder: dive in, 1,000% time commitment to one company, long days and nights with your new partner(s), exhausting and frustration of launching something, satisfaction of launching something, high risk-to-reward, grind and roller-coaster, tap and build ever facet of your talent and potential talent.