I prefer to stick with the original C version.
I am not convinced that the new tools will be better than the originals. The coreutils have been optimized and vetted for over 30 years (most of the tools predate the existence of "coreutils"). Numerous groups have tested them, hit them with crazy attacks, and hardened them against those.
However I use stuff like cp -g for a progress bar from the Rust verskons, and then a dev to come along and contribute that in the GNU C version compared the Rust ones, I think the GitHub Rust version is more inviting and easier?
With tools it is often the thing with "newer, easier" and "old reliable" versions. If you want to write and print a text, Word might be easier, but TeX is still more predictable and reliable. And with software like the literally CORE utils, I actually prefer predictable and reliable over fancy eye candy. I could easily see to have them both installed, so everything that worked before still works without the risk of breaking at some odd point, but might use the Rust version like "Rcp -g" if applicable.
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