I have that one old saddle that came with my vintage Bianchi when I bought it that I'm really comfortable with. I used to swap it from bike to bike because I couldn't find another saddle as comfortable ( I must have 7 or 8 saddles on the shelf that I bought, tried and didn't like) But it was not as comfortable on my old MTB winterbike than it is on any of my 3 road bikes.

Fortunately I have now found saddles that are very comfortable for all my bikes.