What is the best trans fluid these days for an A-727

Not trying to argue,this is why I put..to each his own..I had the ATF4 in my tranny at first,then when I had issues with a cracked casing and swapped internals to another case, I had asked him which is best?This is when he mentioned about the long term problems.I guess it,s all in prefference for your application,which mine is for racing.