I think that the idea that the Thai surgeons are cutting edge/more advanced is mostly marketing. Which is not to say that they aren't sometimes the best choice - it depends on personal priorities. I cared about functionality, looks, and depth in that order, so I chose PI. Someone who wants a lot of depth is probably better off doing the non-penile-inversion method. (Though with that said, I'm not sure any of the big names do "pure" PI anymore; even the ones that say they do supplement the vaginal depth with a scrotal or other skin graft, so it's more about the percentage of skin being used than absolute.) Similarly, the Thai surgeons offer bigger inner labia than is typical from US surgeons and Brassard, so if that's something you like they'd be a better choice.
But personally, I got adequate depth plus a vulva and vagina that work beautifully and look good enough to fool a gynecologist. That's enough for me.
(You can look back through my recent posts for a link to my thorough review of Brassard, but I'm very satisfied.)