I don't know how much you know about Kodak Xtol's "long reputation" but it is worth mentioning, that reputation is not all good. There are many references to sudden Xtol failures. I believe one of the two authors of the Film Developing Cookbook refused to use Xtol ever again after ruining some important negatives in Xtol-gone-bad. More recently there were several batches of Xtol recalled by Kodak Alaris. In spite of that, I continue to use and recommend Xtol (and Eco-Pro), but I do take the extra step of checking my stock solution for activity before each processing run.
I have done a fair bit of reading about Kodak Xtol and the other ascorbic acid + phenidone developers like LegacyPro Eco-Pro, Adox XT-3, Fomadon Excel, etc. While they may not be "exactly the same," I have never heard anyone say they could see any differences in the resulting negatives. Unless someone can offer evidence suggesting otherwise, I believe it is fair to say Xtol and the Xtol-clones are functionally equivalent.
Personally, it makes no difference to me whether I use Kodak Xtol or LegacyPro Eco-Pro. I might be able to say the same about Adox XT-3 and/or Fomadon Excel, but those products are more difficult to obtain here in the US, and I have not yet tried them.