Monodraw's main selling point is that it's a fully native AppKit macOS app. If you value the experience, then you might like the app.

asciiflow.com is great as well.

(Monodraw developer here)

The most obvious difference (and one worth much more than $10 to me) is that one is native and the other is not.

or even the "export to ascii" of draw.io? I would be happy to hear what the advantages could be.