How much safer your data is when using BTRFS over Ext4?

Thanks all for your feedback. I am happy with stability of ReadyNAS OS, I know about snapshots, etc. I remain curious how Netgear handles silent data corruption (AKA bitrot). It appears to me that Netgear did not make any clear declaration here, and that people reviewing ReadyNASes are also unclear about it. Often qouted Ars Technika article appears to be one of the very few attempting to demonstrate how BTRFS may handle that problem, but it does not appear to be aplicable here as it used different NAS configuration.

What I am missing is not unrealistic assurance: "btrfs is 283% safer than ext4", but something similar to a statement quoted below (different product and file system) which would clearly say how specifically ReadyNAS handles silent data corruption. IT is clear from reading various sources that I am not the only one missing such clarification:

"Protection from Silent Data Corruption End-to-end data integrity requires that each data block be verified against an independent checksum. (...)uses its end-to-end checksums to detect and to correct silent data corruption. If a disk returns bad data transiently, (...)will detect it and retry the read. If the disk is part of a mirror or RAID group, (...)will both detect and correct the error: it will use the checksum to determine which copy is correct, provide good data to the application, and repair the damaged copy"