Partnership is a different type of organization than LLC. An LLC offers some legal protections, a partnership does not.
You'd better make sure it's legal. In a partnership the crap hits the fan eventually and it will be good to have everything documented. 3 guys just kinda working together means whoever sold the job will be on the hook for comp., UI, liability, taxes........I didn't mean a legal partnership, but just a business with 3 guys.