There is plenty of differences among which 1/ we don't rely on classic selectors (CSS, xPath, etc) which allows us to be resilient to website updates 2/ we offer a simple UI that automates data selection and structuration and 3/ we are available on Windows and MacOS =)
We use machine learning to extract the content of the page, which means when the webpage changes you don't have to update your selection like Octoparse.