Back in the day, when I first started seeing porn star escorts, I would have said that they were not better than regular escorts. Many of the escorts I saw were just as good looking as porn stars, and, IMHO, better at sex - more into it, less mechanical, etc. The reason to see porn stars, was that there were a few that I really wanted to see but I had to "pay my dues" by seeing other porn stars and building up credibility. And then those major porn stars that I really wanted to see were, as it turned out, were all hit or miss. Some were good, some were not.
These days, I would say that porn star escorts, are probably still not better looking or better at sex than a regular escort but they are...safer. Many of the "regular" escorts are asking for IDs, real job information, real names, and more, including deposits. The porn star escorts I see through an agency, or are people I already know or friends of people I know so I don't have to provide deposits, IDs or anything other than the cash.
Oh, and in my 40 or so years seeing escorts, I've been robbed by "regular" escorts - cash&dash mostly - but I've never been robbed by a porn star. But, then, since I see the porn stars through agencies or friends, I get a heads up if any of them are shady.
Bottom line; I'd rather pay the extra money and see someone I know is going to provide me a good time, then risk money on a "maybe".
Just my $.02.