The difference is that Vector has customers lining up. With large missions like SpaceX and competitors, only large payloads get to choose where their mission goes. Vector focuses on providing dedicated launch vehicle to the individual microsatellite at any time the customer wants to go. They can customize mission requirements for each microsatellite. Nexus is technically just another customer, however the creator happens to be the son of the founder of Vector.
The difference is that Vector has customers lining up. With large missions like SpaceX and competitors, only large payloads get to choose where their mission goes. Vector focuses on providing dedicated launch vehicle to the individual microsatellite at any time the customer wants to go. They can customize mission requirements for each microsatellite. Nexus is technically just another customer, however the creator happens to be the son of the founder of Vector.