>>534996938
The boring answer would be A Corp because they have no backstreets, and presumably any serious threat in the district would get obliterated by Claws and Arbiters.
Out of the ones we've physically visited it's probably P Corp. The architecture is pretty and they're obsessed about creating the safest place in the world. If La Manchaland appeared in K Corp or something they would just send people in there and record them getting raped by bloodfiends.