Weird comparison since it's a label vs. a rap group.
The Wu had a longer prime especially with Ghostface's run in the 21st century(SC, Fishscale, Apollo, etc) and RZA's production work on music, shows, and movies.
But, if we're strictly talking about the 90's, I think this ultimately boils down to preference. The Wu didn't chase catchy radio sounds or funky beats like that. They were all about grimy, boom bap with strong verses and compelling lyrics/stories.
Nobody's going to be playing OB4CL in a nightclub and expecting women to start backing that @ss up to Verbal Intercourse. But, for a strictly personal listening experience, the album feels cinematic and has a strong story to follow with great lyrics.
Albums like Doggystyle, The Chronic, AEOM, and even Dogg Pound are more accessible to the casual rap fan cause of the bombastic funky beats and smooth flows from Snoop and Dre as well as others. The only Wu members who were close to Death Row in terms of accessibility were Method Man and OBD but even they didn't stray far from their grimy hip hop roots despite their R&B collabs and more commercial sound.
Overall, though, I personally have to go with the Wu because, while Death Row has undeniable albums(Chronic, 7DT, AEOM, Doggystyle, Dogg Pound, Above The Rim), the Wu's extended prime is just the gift that keeps on giving especially with their post 90's music.
36 Chambers, OB4CL, Tical, Wu Tang Forever, Liquid Swords, Supreme Clientele, Apollo Kids, Fishscale, Afro Samurai Soundtrack, Bobby Digital, Blackout, How High, Return To The 36 Chambers, OB4CL 2, Kill Bill soundtrack, Soul Plane soundtrack, Czarface, etc.
Also, I get more stank faces listening to verses from the Wu than most emcees from Death Row besides Pac and Kurupt.