Wolf 359 was a desperate sling together of available ships for a sudden Borg intrusion- the Dominion Wars in DS-9 were much different. There Starfleet was deliberately assembling fleets to fight for it's own survival in planned battles.
Also note worthy the fleet was composed of both recognizable canon ships and 'Frankenships' pieced together from parts of other vessels (the DS-9 Technical Manual shows a number of these). It was also mentioned that the Galaxy class ships were put into the field without being completed- large volumes were empty. It was mostly a matter of getting as many guns mobile as possible.