Should the concurrent petition be filed with USCIS using regular or premium processing?

An employee is able to start employment with the full-time employer when the concurrent petition is received by USCIS. It is fine to use regular processing for the concurrent petition. If a concurrent petition receives an RFE for maintenance of cap-exempt H-1B status with a nonprofit partner, it is easier to show maintenance for several months rather than several weeks, thus favoring regular processing.