Effective use of personnel. Can live in U.S. or split time between countries. Increase quality of work by using existing employees. Work, travel, live, do business like U.S. counterparts. Several years' security.
Family can live, travel, study in U.S. Can convert to permanent status.
You can get both permits right at the border. You can still use B-1 status while setting up your U.S. business. Nevertheless, it is a good idea to apply for work permission to arrive before your lease becomes effective. The permission should arrive before you actively manage any U.S. activities. Construction companies in the process of setting up facilities in the U.S. find work permission useful for managers and executives.