Tango is aimed at teams rolling out software, with in-app guidance that walks a user through a live product. That is a different job from documenting a workflow you just did.
Written first, and honestly. A comparison page that cannot name a single thing the other product does better is marketing, not information.
A published GuideGen guide is a link anyone opens — no extension, no account, no product access.
Catch-up capture has no equivalent in Tango.
The API log makes GuideGen useful for reproducing a bug, which in-app guidance does not attempt.
No seats, no minimum, no watermark.
If your problem is guiding users inside your own product while they use it, Tango is built for that and GuideGen is not. If your problem is explaining a workflow to somebody who is not in the product yet, GuideGen is faster and free.
Free, unlimited guides, no watermark and no card. Everything runs in your browser until you choose to publish.