From my limited experience, a partner expects effort out of you, an escort just expects money out of you.
What I mean by this is, if you're having sex with a girlfriend or wife, she is expecting you to put in some effort. She wants pleasing as much as you do. Your performance is going to matter to her regardless of how she acts about it.
But if you're having sex with an escort, she is just expecting you to pay her for her services (she'll probably want respect, but most people want to be treated with respect anyway). She's not expecting you to please and tease her, she's not looking to get off on it and she's certainly not going to be bothered by how well you did or didn't perform. I mean, an escort might like and enjoy you putting in some effort to please her, but her job is to get you off and there will be no negative consequences if you fail to please her.
There are things like intimacy and that, but those tend to be different from person to person anyway. Some girls want to be kissed while you fuck them, others want their ass slapped while you fuck them. I'm sure if you want a really intimate experience there are escorts willing to provide this and will do a better job of it than any girlfriend or wife you'll ever have, but the point I'm making is intimacy is just down to personal preference.
There are plenty of things that are subjective, but the only thing I can say for certain is I've never had sex with a girlfriend who didn't want me to get her off, and I've ever had sex with an escort who didn't want paying.