Beta = developmental editor. Helps with developing the story.
Everything said, i agree with. Except that i am one of those harsh do as i say editors. I do line by line and proofreading. I make the change and underline it and leave a comment. If you dont go with my logic, a logic based on the rules of literature, then I am not for you. Get another editor. I am not there to write your story. And i won't. Dont put a four page description of your school or hospital or house and your main character and twenty other characters in chapter one. I will cut. Dont change tenses midway through a sentence. Cut cut. Dont start with a description of main character, snip. Hence, it is easy for me to cut 2000 words at the beginning of a shabby start. start close to the main action. The rest will follow. Etc.
Once i have edited, i do a restructure. Its your task to see if that restructure works for you or not. Hence, my edit takes two to three days. Editing is not a game. It is a time consuming, serious part of writing. Forgive the errors, i am typing this from my phone.