I follow a three step model:
1. DDG
2. If that doesn't help, then use !s to search Startpage.
3. If that doesn't help, then use !g to search Google.
Other than the relevance and quality of search results, there are differences in features across these sites, like date range search, for example. Image search also seems to have more flexibility on Google. I haven't checked recently if reverse image search even exists on DDG or Startpage.
Other than the relevance and quality of search results, there are differences in features across these sites, like date range search, for example. Image search also seems to have more flexibility on Google. I haven't checked recently if reverse image search even exists on DDG or Startpage.