+1 for Transmit on MacOS - There is no comparison on Windows (and cyberduck is garbage).
It's one of the few reasons that no matter how much Apple may piss me off now a days (all the focus on iPhone and iOS and leaving MacOS and pro users behind) nothing compares on Windows.
If Panic made Transmit for Windows... Let's just say a custom Windows PC is way more powerful then anything Apple is making right now, and cheaper too.