Keep them. I have an Omega D-II that I fit a Chromega Dichro II head on that lives next to a Beseler 45 with a condenser head. For bitingly critically sharp enlargements I use the Beseler with an anti-newton glass carrier, and the Omega handles faster proof work and doubles as a dedicated 6x6/6x7 enlarger.

If you have the space, keep them, you can outfit them all with separate lenses, removing the concern that changing lenses will eventually knock something on the enlarger out of alignment. Hell you can even be like Jerry Uelsman, except he has 7 enlargers in his process line.