Which one should I pick for a new project?

This depends on your project's specific needs — these are two distinct libraries serving different purposes:

blankj/androidutilcode is a comprehensive utility library covering common Android development tasks. Based on the RepoPilot analysis, it has a GO verdict (healthy across all use cases), 33,678 stars, and encapsulates frequently-used functions with complete demos and unit tests. The README indicates it consists of two modules:

• utilcode: commonly-used utilities
• subutil: less frequently-used but beneficial utilities

It's designed to improve development efficiency by providing pre-built, tested APIs for common operations.

cymcsg/ultimaterecyclerview is a specialized RecyclerView enhancement library. It provides:

• Extended adapter capabilities (BaseQuickAdapter, EnhancedQuickAdapter)
• Drag-and-drop and swipe-to-dismiss functionality (via ItemTouchHelper)
• Advanced RecyclerView features like timeline views and multiple item types
• Load-more functionality

Choose blankj/androidutilcode if:

• You need a broad set of general Android utilities across your project
• You want helpers for common tasks (logging, permissions, file handling, etc.)

Choose cymcsg/ultimaterecyclerview if:

• Your project heavily relies on RecyclerView with advanced features
• You need drag-and-drop, swipe-to-dismiss, or enhanced adapter patterns
• You specifically need timeline views or multi-type item support

Most projects would benefit from both — they solve different problems and can coexist. ultimaterecyclerview is specialized for list display; androidutilcode covers broader development needs.

FOLLOW_UPS:

• What utilities does androidutilcode actually provide?
• How does ultimaterecyclerview compare to standard RecyclerView?
• Are there any known issues with either library?