No idea why folks still use stuff like this when there are open source alternatives like 7zip and Nana Zip.
I use WinRAR (as a switch from 7-Zip) because it works well enough, is fast and stable and has good compression. For me, switching to another Windows archiver would have no merit.
It is. Coincidentally, security was one of the reasons to uninstall 7-Zip.
Is WinRAR really faster, more stable, and has better compression than 7-Zip? I haven’t used WinRAR in probably over a decade at this point.
It depends. The RAR5 format used by newer WinRAR versions (the “old” one is still supported just well) can have smaller archives than 7z, but the opposite is also true. Still, yes, WinRAR is in my experience faster and more stable.
(Note that “as small as possible” is not usually the most relevant point. The best compression is currently reached with the ZPAQ format, but using it with maximum compression settings is painfully slow.)