I'll speak about this in reference to traditional Mistresses and also, dominant bodybuilder/fitness ladies. For me it was never a matter of one versus the other, it was a matter of opportunity, and I had my fair share. I mentioned I started out a bit in college, and then a decade later, and it was all local where I built up a loyalty / camaraderie with certain traditional Mistresses over the years and became a regular, especially in the late '80s into the '90s.
In the dominant bodybuilder/fitness category, from the early '00s until the late teens when I was active, there were few local women who were really dominant. The city was, maybe still is, a major drawing card for touring Amazons and I became a regular with a handful. I've seen them when they have come here, and when I was on business, when I was in their cities. In my case, after a couple of sessions with a few traveling female bodybuilders, I was able to build up a chemistry and it is like being a regular with a local Mistress. The anticipation of having a business trip to a place where you know one of these Goddesses, or they are on a tour going to your town is tremendous. (The set up emails, a call or two about logistics, her hotel/home or my hotel, possible activities... very hot.) I had that with two Dominatrix / bodybuilders, each for a half dozen years or so. With one in the U.S. we wound up seeing each other twice, maybe three times a year. The other, from overseas, it was once a year. But all the sessions were memorable... as if I was a local regular with them.
Great question! And yes, I know I've been lucky.