I can't speak specifically about the Rodenstock APO 105mm, but I had a Rodenstock APO 50mm with which I was very disappointed. I don't know if I just got a bad sample, or if my lens was indicative of the line, but it surely was not worth its appreciable pricetag.(posted 8366 days ago)I think the most consistently fine enlarging lenses are the Componons. I don't think you'll go wrong with a 100mm Componon.
Incidentally, I talked to the Schneider VP in charge of the Componon line at last years Photo Expo in NYC, and he told me that the Componons were in fact APO lenses, in terms of correction of chromatic abberation. The other thing is, if you poll professional labs, you will see a stong predominence of Componons. That alone should tell you something.
The other things to consider, perhaps even more important than lens brand, is getting the enlarger perfectly aligned and holding the negative flat. A glass carrier, while admittedly troublesome, is the only way to really ensure edge to edge sharpness.