These package names are pretty confusing, they seem like they do the same thing yet 'fetch' looks to be abandoned yet not marked as deprecated (last commit 3 years ago). Judging from the download counts people are probably downloading 'fetch' when they should get the supported and maintained 'node-fetch' package.
If you're building a Reactjs app, is fetch already built in? If so, is it different than 'node-fetch'?
What is the suggested package npm users should use?