What sets it apart is only storing the "fatal pages". That's the entire point.

Those of us who keep accumulating tabs often do so as a "I think I care about this in the near future" halfway bookmark. I don't know about you, but my browser history for just this morning (it's noon here) is already so extensive that it's worthless for that purpose. When I do need to find something with Onetab, it's maybe 1% of the size of my browser history or less.

EDIT: What's more is that when I reopen, it disappears from the list, whittling down what's left over until I can confidently press "delete all" for a given activation (it groups the tabs by which were open when you pressed it; but you can also drag and drop the "bookmarks" from one list to another)