Just saying that 7-Zip is great, both the compression (I use it for most of my data archival, because the higher compression ratio is worth the longer times to compress) and the software itself, pretty much what a good archival program on Windows should be like.

On other OSes, I guess I just use whatever is included with the distro, or something like PeaZip: https://peazip.github.io/

Curious to hear from RAR proponents.