Flood Buzz wins for simplicity and coverage at many locations. LP365 wins where automatically stopping the water is more important than installation simplicity.
Flood Buzz: distributed detection
A simple sensor can be placed almost anywhere and does not require plumbing modifications. That makes it easy to protect many fixtures cheaply.
Its weakness is response: somebody has to hear the alarm and act.
Frizzlife LP365: detection plus intervention
Frizzlife includes LP365 in its current catalog as a leakage-protection product. Automatic shutoff architecture is especially useful around RO systems and other continuously pressurized equipment.
Any valve-based system should be installed where it can be serviced and tested periodically.
Which architecture is safer?
For an occupied home, several local alarms can provide good practical coverage. For unattended properties or a high-consequence location, shutoff capability is more valuable.
A layered strategy can use both: inexpensive sensors in many rooms plus one main or appliance-specific automatic shutoff.