Read the book "post exposrue" by Ctein (it is available as free download on his webpage); he compared quite a few enlarger lenses.
The late Barry Thornton writes in his book "edge of darkness" about testing quite a few enlarger lenses. IIRC he came to the conclusion that sample variation might be of more influence that the lens design itself.

Personally I have never used APO enlarger lenses. My Nikkor 50/2,8N is impressive and beats all 80mm lenses I've compared it against (Rodagon old & current, Schneider Componon, Meopta Anaret, unnamed japanese lens). The "lowly" 4 element lenses held up very well, sometimes being better in the center that the 6 element lenses. These had the advantage in the outer borders.