It's an interesting conversation topic. I usually ask the question: where is your bread buttered? (what is your primary source of income?)
So are you a provider who also has an OF to sell some content, or are you primarily an OF girl who is willing to meet clients? Personally, I prefer the former, because they're more likely to take their job (meeting me) seriously.
Why does that matter? It comes down to professionalism, and taking your job seriously. Some dudes overlook this stuff, but it's more than bomb sex and awesome looks. Things like personal hygiene, discretion, cleanliness (this hotel is an unsafe dump,) etc.
I could be wrong, but I think the former cares more about these things than the latter, which is why I prefer seeing them instead.
But it's not clear cut and dry, though we'd like it to be. There are some OF girls that started out in sex work as providers, than transitioned more into "full time" OF girl, so it all depends. Some examples of this are Ashley Barbie Baby, Taylor Nicole, a couple others I can't think of at the moment.