Completely subjective to the person. I've never had an issue with any stock saddle, from the one on my 78 Le Tour (I believe the colloquial term is azz-hatchet), to the one that came off the fiancee's mixte and went on my Peugeot (to replace an aftermarket saddle the PO put on that absolutely did not fit me), to the comfy one on my Scott MTB, that I wish I could find a box of NOS sitting around somewhere. Others think all of those are junk and not worth your time.
For aftermarket, my touring bike came with an old Avocet Touring saddle which is incredibly comfortable, albeit long and constantly snagging my tights if I want to stand up just a little on the pedals.