Thanks all for the great detailed responses, and for sharing your personal experiences with us. The same as many of you, I think that indies are a better choice only if they're truly independent and they feel comfortable and secure providing the erotic service requested. Also SPs need to have the right attitude expected by clients in the adult entertainment industry, such as SPs should cater to the needs of their clientele (male/female/couple).
There are some websites (which I won't mention by name), but they promote themselves as erotic social networks which bring clients closer to independent SPs in an environment where both parties can build meaningful long-term relationships with one another.
I think that SPs that provide local erotic services benefit the most from such relationships with their clients. That is, by knowing clients' sexual fantasies, SPs can provide a better erotic service. Additionally, when SPs focus on quality and not quantity they minimize the risk of sexual deceases as well as the risk of potentially client physically hurting/abusing SPs.