Outside flood control system.
Inside indirect waste system( lift station).
Both have the same efficiency with the note that the outside flood control system can be service by the service technicians without going inside of your home and is cleaner.
Because we install several in last 3 years and since than the homeowners do not have any more issues with the flooding. But don't forget like everything created by humans needs to have periodically maintenance.
BBP PLUMBING INC.