That said I try to use DDG when I can but I don't lie to myself that I'm using it because it has better results -- it doesn't. It has better approach to privacy and thats why I use it. The fact that they know less about the searcher intrinsitcally means the results of searches will be worse.
These threads always follow the same patterns, someone asks if they know of an alternative search engine and a HNer quickly mentions they have gone to DDG and haven't looked back.
DDG is decent but not even close to the search quality of Google. I know the folks here want to see Google dethroned but DDG won't do it.
Google provides great results for common old-ish and repeated questions but you will notice less diversity - which can be pretty frustrating when you aren't looking for a definite answer.
You will find that it will give you old results from w3schools, codeacademy, SO, etc. Some of which shouldn't go into production...