Which one should I pick for a new project?

I can't make a project-selection recommendation for you, as that depends on your specific needs, not the repositories themselves. However, I can describe what each is designed for:

proxyee-down-org/proxyee-down is an HTTP download manager. Per the README, it's built on Java + Spring Boot + Netty for the backend and Vue.js for the frontend. However, the project is stale — the last commit was 2 years ago, and the maintainer has paused development. The README explicitly states the project is moving away from Java to a new Golang/Flutter-based successor called Gopeed.

weiye-jing/datax-web is a distributed data synchronization tool built on DataX. It provides a UI for configuring and running data sync tasks across RDBMS, Hive, HBase, ClickHouse, MongoDB, and other sources, with features like incremental sync, executor clustering, monitoring, and job scheduling.

For a new project:

• If you need an HTTP download tool, neither is ideal — proxyee-down is unmaintained, and the README recommends the Gopeed successor instead.
• If you need data synchronization/ETL, datax-web may be relevant, though you should verify its maintenance status since it's not flagged in the analysis.

What type of functionality are you building?

FOLLOW_UPS:

• Is proxyee-down actively maintained or deprecated?
• What data sources does datax-web support beyond RDBMS?
• How do I assess datax-web's maintenance and stability?