Enlarging lenses are rarely used wide open, except for focusing, so the speed doesn't matter much for sharpness in the print.
The 50's will give you a tad more magnification, which might be valuable if you want to make large prints. OTH, if you want to print small, the 60 might have some advantage. Either depends a lot on your enlarger and how high or low it's able to go.
Otherwise any of the three should be excellent performers. The Nikkor 50 2.8 has a very good reputation, as do Rodagons.
A fellow named Ctein did a comprehensive test several years ago comparing enlarging lenses. The test is published in his book Post Exposure I don't have my copy handy, but I know the 50 Rodagon and El Nikkor scored very closely. I don't know about the 60 Rodagon.
If they are similar in cost, you can choose according to condition, especially of the glass, and perhaps features, such as illuminated f/stops and not go wrong.