[metadat]

"Best" is super subjective and difficult or impossible to measure. It's in the eye of the beholder.

Oracle DB is the "do everything database", it has nearly every DB paradigm "all-in-one", and is an extremely well-tested and predictable product. It often comes bundled with entire vertical solutions like "Bank in a Box" or "CRM", and with a contract including SLAs, so you're covered if/when things go wrong (as long as you pay $$$).

There are a lot of pros and cons, too many to enumerate on a Thursday night before dinner.

Bottom line: Oracle DB can be super expensive, but if you pay [enough] then Oracle will give you endless support to ensure you are successful (so you can keep paying them). They have some top-notch in-house expertise and there are good reasons large businesses keep paying the bill and renewing contracts (some part lock-in, other part solving real business needs).

Personally, I really like Postgres and SQLite. But they're no Bank-in-Box, and the support is comprised of "https://google.com/?q=...".