Personally, I see 90s Spider-Man beginning with the introduction of Venom (which happened very close to the marriage and the 'death' of the Hobgoblin) and ending with the Revenge of the Green Goblin arc. Before then, it was a noticeably different period, with the original Hobgoblin dominating everything and the art still being relatively traditional. Then McFarlane and his spiritual successors started drawing the comics and symbiotes (and then clones) became the big thing, as well as big events like the 'death' of Harry. Even after the reboot, I personally feel that the Spider-Man comics still had a very strong post-Clone Saga vibe which stayed in place until after the Revenge storyline, where new elements were added in like JMS' totems and Morlun that took Spider-Man in a very different direction than before. After Ben Reilly 'died' in 1996, I feel like the Spider-Man comics felt quite rudderless for some time until JMS came along, with the writers unsure to completely whip back to a traditionalist, pre-Clone Saga Spider-Man or continue with new stuff. What we got I feel was an awkward mixture of the two.