As always, it's the software which makes the difference; and today's software is mostly CRAP, light years behind the hardware. Starting from operating systems (Windows 8 anyone?) to applications (Microsoft Office.) I REFUSE to believe that I need 2Gb of RAM to run an operating system. I REFUSE to believe that to write a letter I need a program which requires 1Gb of RAM and takes 1Gb hard disk space. That's just sloppy, godawful programming.
I am routinely using a Macintosh SE/30 with 16Mb of RAM and a 250Mb hard disk; I write documents with Microsoft Word 5.1a (which can even be read by Office up to the 2000 version) or spreadsheets with Excel 4. I can even play a few decent games, and connect to the internet to check email or transfer files from my PC. I have A/UX installed on the same machine, with a full complement of development tools, and it also runs native Macintosh applications. This machine can boot its OS FROM A FLOPPY! The whole System 6.0.8 lives on a floppy disk! THAT was a feat.
I have never owned an Amiga, but soon (thanks to Petro Tymschenko!) I will get an Amiga 1200 so I will see what it can do.