It has an X server built in, which has come in extremely handy. Yes, there are other X servers for Windows, but with mobaxterm I don't need to faff about configuring it, and it's a nice terminal otherwise, so when I realize I do need to pop open a graphical program on a server, I can just do it with the terminal I'm already using.

The drag-and-drop file transfers are also great.

Yes, you can get a lot of this stuff with WSL, but my work laptop doesn't play nicely with WSL at all (some interaction with the antivirus reliably BSODs).

One thing I cannot for the life of me authoritatively, confidently understand is whether WSL2 requires a Type 1 hypervisor running under baseline/parent Windows OS. It appears that it does, and that is just a massive deal-breaker for most of my PCs :(

Moba supports bookmarks and SFTP among other features