I knew almost nothing about the Amiga back in the day. I was pure 100% PC. Worked my backside off part-time to earn upgrades to bring my little 286 PC up to 486 standard around the early 90s. So I suppose that I was a little late to the party at that stage. I used to read about Amigas and saw the magazines on the newsagent stands. They let you page through the magazines in the store so I remember trying to understand what they meant when they spoke about Amigas, the ECS chipset and the Zorro bus.
I was also into graphical demos then and the Amiga was often mentioned in readme.txt files or credits rolls. So it always had an allure for me. Only 1 person I ever knew actually had an Amiga back in the day however - a friend of my brother's who's family ran a print shop - and I remember hearing how much better Worms and Lemmings were on that machine. By the time I had money in hand and was shopping for a computer of my own however it was all PC all the time locally here in South Africa. Having spoken to people here more recently there seems to have been quite an active Amiga scene here - but I don't remember having any contact with that at the time.
More recently I have started learning as much as I can about the platform by reading EAB and other places. I now also own an A1200, an A600 and I'm on my way to having all the parts of an A500 as well. It's a fantastic platform that had its potential basically thrown away by the corporate greed at Commodore. The platform was very closely linked to the PAL/NTSC TV standards however with "proper" monitors always being a second priority and that counted against them eventually. It helped them in the early days with monitors being so expensive, but they really needed that new chipset by about 1991 to compete with VGA and what the Mac had via NuBus expansion slots. AGA was too little too late IMO and having a 16-bit Paula would have kept the platform a bit more relevant as well.
The Amiga floppy disk was a weird beast. As cool as it was to be able to store 880k on a DSDD floppy in 1985, the standards Commodore chose did not become the accepted standard. Not having the option to read 1.44MB MFM floppies as used by the rest of the industry was another big mistake. It would at least have helped considering the fact that so few Amiga's came with an HD drive to keep the price down. Monkey Island 2 for Amiga is a joke when it comes to floppy swops. That joke in the first Monkey Island about "insert disk 256" almost came true!
The big difference between the PC and the Amiga was the price-point they were aimed at. Price-wise the Amiga packed a heck of a punch from 1987 until the early 90s. But by 93 or so, while PCs were often still more expensive you could customise them to be cheaper and gradually upgrade them (as I did at the time). There could have been a gap for a cheaper machine to compete against PCs even into the early 90s if Commodore had not strip-mined their R&D department by then. As it was they coasted on the impeccable design of the a500 until PCs simply became cheaper and better. Doom was just the last nail in the coffin IMO.
While the A600 is actually a decent machine to own now, at the time it was released it was just ridiculous. Anyone releasing a personal computer with a 68000 CPU in 1992 and more expensive than an A500 should have had their head read. At least allow the user to install fast RAM!
I have a lot of nostalgia for PC stuff pre-1992, since my family had a horrible Juko XT clone until about 1992, but for almost any game made from 1987 until the early 90s, the Amiga version is usually the better version, and that's a lot of games. Including many titles I had not played before so I really enjoy using my A1200 today. Plus there are still demos and games coming out for the platform all the time. I regularly copy new software to a CF card and put that into my A1200 to transfer it across. Lots of fun to be had.