Well, XFree86 ( before Xorg and before KMS ) was an adventure. I spent hours guessing the vertical and horizontal frequencies of my monitor trying to get decent resolutions.
Other than that, Linux was way more work but “felt” powerful relative to OS options of the time. Windows was still crashy. The five of us that used OS/2 hated that it still had a lot of 16 bit under the hood. Linux was pure 32 bit.
Later in the 90’s, you could run a handful of Windows apps on Linux and they seemed to run better on Linux. For example, file system operations were dramatically faster.
And Linux was improving incredibly rapidly so it felt inevitable that it would outpace everything else.
The reality though was that it was super limited and a pain in the ass. “Normal” people would never have put up with it. It did not run anything you wanted it to ( if you had apps you liked on Mac, Windows, OS/2, Amiga, NeXTstep, BeOS, or whatever else you were using ( there were of potential options at the time ). But even for the pure UNIX and POSIX stuff, it was hard.
Obviously installation was technical and complex. And everything was a hodge-podge of independently developed software. “Usability” was not a thing. Ubuntu was not release until 2004.
Linux back then was a lot of hitting FTP sites to download software that you would build yourself from source. Stuff could be anywhere on the Internet and your connection was probably slow. And it was dependency hell so you would be building a lot of software just to be able to build the software you want. And there was a decent chance that applications would disagree about what dependencies they needed ( like versions ). Or the config files would be expected in a different location. Or the build system could not find the required libraries because they were not where the Makefile was looking for them.
Linux in the 90’s had no package management. This is maybe the biggest difference between Linux then and Linux now. When package management finally arrived, it came in two stages. First, came packages but you were still grabbing them individually from FTP. Second came the package manager which handled dependencies and retrieval.
The most popular Linux in the mid to late 90’s was Red Hat. This was before RHEL and before Fedora. There was just “Red Hat Linux”. Red Hat featured RPMs ( packages ) but you were still installing them and any required dependencies yourself at the command line. YUM ( precursor to NRF ) was not added until Fedora Core 1 was release in 2003!
APT ( apt-get ) was not added to Debian until 1998.
And all of this meant that every Linux system ( not distro — individual computer ) was a unique snowflake. No two were alike. So bundling binary software to work on “Linux” was a real horror-show. People like Loki gave it a good run but I cannot imagine the pain they went through. To make matters worse, the Linux “community” was almost entirely people that had self-selected to give up pre-packaged software and to trade sweat-equity for paying for stuff. Getting large number of people to give you money for software was hard. I mean, as far as we have come, that is still harder on Linux than on Windows or macOS.
You can download early Debian or Red Hat distros today if you want to experience it for yourself. That said, even the world of hardware has changed. You will probably not be wrestling IRQs to get sound or networking running on modern hardware or in a VM. Your BIOS will probably not be buggy. You will have VESA at least and not be stuck on VGA. But all of that was just “computing” in the 90’s and the Windows crowd had the same problems.
One 90s hardware quirk was “Windows” printers or modems though where the firmware was half implanted in Windows drivers. This was because the hardware was too limited or too dumb to work on its own and to save money your computer would do some of the work. Good luck having Linux support for those though.
Even without trying old distros, just try to go a few days on you current Linux distro without using apt, nrf, pacman, zypper, the GUI App Store, or what have you. Imagine never being able to use those tools again. What would that be like?
Finally, on my much, much slower 90’s PC, I compiled my own kernel all the time. Honestly multiple times per month I would guess. Compiling new kernels was a significant fraction of where my computing resources went at the time. I cannot remember the last time I compiled a kernel.
It was a different world.
When Linus from LTT tried Linux not that long ago ( he wanted to game ), he commented that he felt like he was playing “with” his computer instead of playing “on” his computer. That comment still describes Linux to some extent but it really, really captures Linux in the 90’s.