GUIDs / UUIDs are the most widely supported identifiers across databases, APIs and programming languages. However, many systems also use ULID (Universally Unique Lexicographically Sortable Identifier) as an alternative to achieve better time-ordering, improved database index locality and a more human-friendly encoding.
For the safest, standards-based choice, use GUID / UUID v4 (fully random) or GUID / UUID v7 (time-ordered for databases). Consider ULID only when you explicitly need its Base32 encoding and your ecosystem supports it.
For the safest, standards-based choice, use GUID / UUID v4 (fully random) or GUID / UUID v7 (time-ordered for databases). Consider ULID only when you explicitly need its Base32 encoding and your ecosystem supports it.