Which one should I pick for a new project?

I can only answer questions about google/exoplayer or jodaorg/joda-time.

However, based on the repository data, here's what you should know:

google/exoplayer — Do not use for new projects. [README.md:L1-L17] states clearly: "This GitHub project is deprecated. The latest version of ExoPlayer is published as part of AndroidX Media3." The last commit was 9 months ago, and exoplayer:2.19.1 was the final release with no future releases planned. The project has moved entirely to https://github.com/androidx/media.

jodaorg/joda-time — This repository has no deprecation notice in the provided data. It appears to be actively maintained for date/time handling in Java applications.

Recommendation:

• If you need video/media playback, use AndroidX Media3 (the successor to ExoPlayer, not this deprecated repo).
• If you need date/time utilities in Java, jodaorg/joda-time is a viable choice, though modern Java projects often use java.time (added in Java 8) unless they require Joda-Time's specific features.

FOLLOW_UPS:

• What is your project's primary use case?
• Does Java 8+ java.time work for your needs?
• Are you migrating existing ExoPlayer code?