I've used Sardu on Windows for making multi-iso bootable USB sticks a long time ago in the past, but I'd admittedly never looked at their ToS or Privacy Policy. My use case was slapping some live boot antivirus scanners, data recovery tools, and one or two lightweight liveboot-Linux ISOs on one USB as a portable toolkit.
When I'm making anything else from Windows, I've always stuck with Rufus. Had never heard of BalenaEtcher before now.