Scrapebox is for creating backlinks from blogs - meaning it creates blog commenting backlinks; SeNuke XCr creates backlinks from bookmarking sites, forum profile backlinks, and many other backlinks. Also Scrapebox is much, much cheaper - it costs $57 with this link - http://www.scrapebox.com/bhw and also it has some other useful features not related to SEO and link building; Cheers, Alex
not recommended use these two tools. Google spam team already banned these two software in the internal spam checking.
Unless you don't want rank google search, never ever use these two software.
If you don't believe me, you can ask the questions on the Google support forum https://support.google.com/webmasters/answer/35291?hl=en
or write a email to them.