Bluetrew, whilst the two drugs are usually alternatives and can produce similar outcomes, there have been lots of cases where abiraterone use has been a breeze (mine was, no side effects at all) and can give a couple of years without PCa progression, indeed, good PSA reduction, as it did for me. I kniw of examples where Enzo has been difficult to handle and ineffective, although men on here have been very happy with it, but I have never tried it. Be guided by your onco. He/she may be able to assess which would be the better route to take and maybe able to ho!d out the prospect of a swap if the first one tried doesn't cut the mustard.
Good Luck
AC