I say “most of your desired criteria” because it’s rare to find an editor who will meet all your criteria. For instance, you may have to pay a few hundred to a few thousand dollars more for your top pick. Or, you may find someone at your precise price point, but their experience isn’t quite what you’d like it to be. You must be the one to assess what trade-offs you’re willing to make.
Obviously there is a big difference. I actually started with screenplays (with some mild success) partly due to hearing that as long as you have a good story, the grammatical errors won’t be a big deal. Well, that was not true. Maybe if a producer liked the story or I was already established but every contest I entered always came back with feedback about the grammatical errors. Even if I won or placed as a finalist, I always received critique on that. Very little is spelling error, it was more about structure, etc.