rand vs rand_core
No leader: the top candidate rand has only 0.22 confidence (low), below the 0.35 needed to declare a winner. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
What each one is
The product in its own terms, so the numbers below have context.
rand
Extended documentation for Rust's random number library, including quick start, crates overview, users' guide, and contributor guidelines.
rand_core
An open-source Rust library providing foundational traits for implementing random number generation algorithms. It supplies the core interfaces that RNG implementations build on, along with helper utilities for algorithm development.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.