It's never just one. They're localized. They tend to occur when the industry finds a groove and leans into it, so the focus is more on quality and iteration under criticism, and less about rough experimentation. The early PS1 era was a Cambrian explosion of weird 3D nonsense... and I don't think anyone nowadays would put that above late SNES releases. The defining titles of the PSX didn't come around until the very late 90s, and several of them sold like crap. Nobody wanted Symphony Of The Night until their friend would not shut up about it.

But over on PC, the 90s were a smooth ramp of increasing power and relevance. The 3D accelerator era laid the groundwork for the Glorious PC Gaming Master Race mindset, with visual quality and variety unmatched until the late PS2 era. (By which point Crysis had advanced PC graphics ten years into the future.)

And in 90s handheld gaming, there was the Game Boy, and nothing else mattered. Sega kept the Game Gear limping along until 1997, but nobody noticed, because everyone and their mother already chose the monochrome brick that sipped batteries. Several companies eventually gave up and released greyscale machines just in time for Nintendo to fuck them with the Game Boy Color. All the while, the platform went from twee single-sitting high-score fare, to bespoke long-form RPGs and major franchise sequels, to essentially-complete demakes of Super Nintendo games. Nothing changed except ROM size. It was the last 8-bit console, and it took developers a decade to recognize they could go hog wild on it.

Right after that, the Game Boy Advance's brief lifespan was essentially all golden era. Doom was practically a launch title. Homebrew devs kept teasing Quake, Metal Gear Solid, Resident Evil 2, etc., alongside whole-ass GTA3 clones. Commercial releases were awash in good-to-great RPGs and metroidvanias. But then - the PSP scared Nintendo into creating the DS, and that platform went through some awkward years struggling to use better hardware. That wasn't the end of "the" golden era. For the PSP it was briefly fantastic, especially if you count its use for emulators. But it fell as the DS found its legs, while some completely unrelated trends happened to consoles and computers.

All we can say for certain is, nothing inside a video game should cost real money, and DRM is delayed theft.