Being someone that was in the streets and clubs heavy in NY and Jersey during the Bad Boy and Roc-A-Fella eras, I'll give the slight edge to Bad Boy. From 95 to 97 (97 being the peak) that Bad Boy sound ruled everywhere. You have to also factor in the remixes Puff and the Hitmen were doing with the R&B acts. And really, that was the only thing Bad Boy had over the Roc (being able to be a force in the R&B market as well as Hip Hop). But Roc-A-Fella picked up where Bad Boy left off and had a strangle hold over here. You got to remember, by 2000, Jay was the hottest rapper on radio, mixtapes, to be interviewed on MTV/BET/Hot 97, headlining Summer Jam, hottest rapper to get their records played and perform at the Tunnel, etc. From 01-03, State Property were in competition with G-Unit and D-Block as far as who had the hardest music/freestyles on the streets and mixtapes. When Cam got on he reinvented himself, introduced the Dipset brand to the world, and changed the culture. Dipset extended the Roc's run significantly and gave it new life. The movies with Paid In Full being an undeniable classic. Their in house producers (Kanye, Just Blaze) help changed the soundscape of the music during the early 00's with Kanye emerging as their last big artist to break out toward the end of their reign. And I would go as far as saying Roc arguably had a longer run then Bad Boy (
@FreshAIG says 98-02 but I'll say 98-03 with 03 officially becoming the changing of the guards with 50 and G-Unit).
Now overall, I'll give the nod to Death Row. I can't speak from a Cali nikka perspective, but over here DR took everything by storm. Chronic and especially Doggystyle was being played EVERYWHERE. Death Row laid the blueprint for Bad Boy and Roc-A-Fella to be successful.