i've had amzing GG4 and crapola GG4. when it's proper, it's very nice for a fuel-strain. ...out on a limb... ...i'm gonna say time & place depend on the place. nor-cal/bay-area had some amzing stuff in the late '90s early '00s. my memories are of a lot of trainwreck, GDP, purple-urkle, purple-kush, blue-dream(was good then-hate it now), blue-dragon(haven't seen it since), deitroit(?) diesel, hmm...can't remember. white widow was old by then but it's still got a good value when a keeper is grown, imo. and some widow hybrids are real porn stars.
edit2: remembered some other strains from the time: OG kush--duh, super-silver-haze, silver-bubble, purple-gorilla(grape-ape?), early on a bit of real-roadkill-skunk & northern lights, but they were moving on by then. ak-47, had the BC big bud 'beesters' and yeah it was shit, my friends' mom had mexican brick weed or the norc-cal hippie equivalent. i recall she said all her grower friends quit because their weed was too shitty to compete with indoor or high quality outdoor. was so weird/amusing to me. she did however give us some supposed jamaican bud dipped in hash oil & that was probably my first super-high.