Unlike most Amiga users I had a PC before I bought an Amiga.
I had a 286 before I picked up a 500. The 500 was better than the 286 at most things but it had no hard drive (HD). The 286 recieved many OS upgrades of MS DOS until MS Windows 3, while I never upgraded the 500's OS. Both got RAM upgrades.
As my interests increased (programming, art and video) the 500 became restrictive, so I moved to a 2000HD (great for games with HD support) and a better experience overall. I did upgrade the 2000 with more RAM,SCSI CD ROM, ethernet, Scan Doubler,Amiga OS 3 and a video card (GVP Spectrum). By 1990 even Commodore had included a standard Graphics card in the Amiga 3000UX model. If the Software publishers had taken advantage of the features my expanded 2000 the games would be similar to the Dell 486 I had at that time. In fact the 2000 setup might even play Doom since better it had more RAM than the 486 and equivalent video cards. Of course when simm memory prices dropped I maxed out the memory on the 486 and installed windows 95.
I bought a 4000 (for AGA and IDE) and moved some of the 2000's Zorro expansions to it, so it was never stock. The 486 got replaced by a Pentium,then a PII, P3 an P4. By now the Amiga software market had dried up but the few new releases were finally taking advantage of the Amiga 4000's video card, HD and RAM. A4000 upgraded to Cyberstorm 060, 146 MB RAM (w. chip mem) up to 154MB with GVP scsi card installed. Algor USB, 40 GB HD, DVD ROM, OS 3.9, Mediator Di, and PCI Voodoo 3000 GFx.
The PC hardware might have passed my 4000 in about the late 90's with the intel/AMD Mhz war and AGP, but until XP came out in 2001 it was'nt as nice to use.