The lines you're going to read are biased ramblings; take necessary caution.
Amiga lost most of it's value when PC games started to become better. Amiga became just the multimedia computer but companies advertised multimedia as if multimedia meant CDROMS and Midi Soundcards. (When people were making movies with Amiga) (had to share this sorry) 😀
If a game not 3d, is harddrive installable, is made for an AGA Amiga with and equivalent Ram and CPU (286 vs 68000, 386 vs 68030, 486 vs 68040, Pentium-100 vs 68060-50) , then it always has the potential to be better than the DOS version. If it supported sound and graphics cards on the Amiga too, then it definitely would be better on Amiga (even 3d).
If I were to compare an Amiga500 with 7mhz CPU and 1 MB Ram, I can easily say any game that wasn't 3d and had scrolling in it destroyed the PC version even if the PC had hundreds of megahertz.
One huge advantage of Amiga games over the PC versions was that Amiga sends 50 frames of data to the monitor which also runs at 50hz. There is no screen tearing and the concept is alien to Amiga. This is a problem the PC solved only recently.
Another advantage of Amiga was the music and the sound effects. Just compare some of the most memorable soundtracks. For example Lotus3.
When I had an Amiga 500, a friend of mine had a 486 with 8mb and Sound Blaster16. Whenever he saw an Amiga version of some game. He opened his eyes widely and said. Why does it feel and sound better! One time he got angry and left 😀 After I bought an Amiga1200 and connected a 3.5" 100MB harddrive ( which he threw out of his PC and gave to me) He was in delirium when he saw my Amiga boot to a highly expanded Workbench in 7 seconds ( and I was listening to a mod, formatting a floppy in DOS format in order to copy some mods and pics to him), when he was trying to install Windows95 on his 486 (it booted in 30minutes and crashed after 15minutes)
The PC always had the cheaper and faster CPU's. 3D games were much faster on the PC and VGA. That's when Amiga lost the battle. "Doom" is the Amiga killer.
It took more than 15 years for PC to catch how Amiga was.
Today I use my Amiga4000T with PowerPC acceleratorand many other expansions. It leaves me with a strange feeling. I always feel, I can do more with this machine.
One huge mistake when people compare Amiga and PC is that they start comparing an Amiga500 with 68000-7mhz with an 386... and then Pentium... and then Gravis Ultrasound... but they forget to upgrade their Amiga. It's still the same old Amiga. Why don't you upgrade to 68060, install 128Mb RAM?