GUIDs / UUIDs are the most widely supported identifiers across databases, APIs and programming languages. However, some systems use KSUID (K-Sortable Unique Identifier) as an alternative to achieve better time-ordering, larger ID space (160 bits) and second-precision timestamps with Base62 encoding.
For the safest, standards-based choice, use GUID / UUID v4 (fully random) or GUID / UUID v7 (time-ordered for databases). Consider KSUID only when you need its specific 160-bit size, second-precision timestamps or your ecosystem already supports it.
For the safest, standards-based choice, use GUID / UUID v4 (fully random) or GUID / UUID v7 (time-ordered for databases). Consider KSUID only when you need its specific 160-bit size, second-precision timestamps or your ecosystem already supports it.