SpaceX received fixed price contracts at lower prices than Boeing's and then delivered on those contracts, ferrying 7 full crews and one test crew to and from ISS with an 8th full crew about to return and a 9th soon launching, all with no additional charges.
Boeing has charged hundreds of millions above and beyond the fixed price contract and has yet to deliver and return astronauts from ISS on a single completed mission.
SpaceX received fixed price contracts at lower prices than Boeing's and then delivered on those contracts, ferrying 7 full crews and one test crew to and from ISS with an 8th full crew about to return and a 9th soon launching, all with no additional charges.
Boeing has charged hundreds of millions above and beyond the fixed price contract and has yet to deliver and return astronauts from ISS on a single completed mission.