It was cheaper than a PC and much nicer to use - Windows was terrible in that era, the janky mouse jumping all over the place under load due to no hardware sprite and serial buffer overrun.
Meanwhile an Amiga under 100% CPU would have a silky smooth mouse due to hardware mouse port tracking and sprite pointer.
Then you had stuff like autoconfig hardware that was 10 years ahead of its time.
Amiga was smooth just as long as CPU usage was low and as long one used the stuff that its chipset could do.
And all that "smoothness" was useless once one got above what TV can do. I used PC for DOS Tango (schematic and PCB CAD) for example and even cheap Tseng ET-4000 card with 1MB would put Amiga to shame as it could do 1280x1024x16 colors.
Yes, animation speed wasn't great, but it worked. Two years later I had Diamond Stealth 2MB which could do 1600x1200x16 colors, running circles around anything any Amiga could do.