[dikei]

Not a good example, as the de-facto logging interface for Java was SLF4J.

Though I myself prefer Log4J2, as I'm already using Log4J2 as the concrete logging implementation.

[funcDropShadow]

Why do you prefer Log4j2 over the slf4j api and why over logback as the backend?

[dikei]

I prefer Log4J2 built-in JSON Template Layout to Logback's various JSON output solution.

The API of Log4J2 and SLF4J v2 are similar enough that it does not matter for basic usage, I don't see the benefit of SLF4J in a project that's already using Log4J2.