The first computer I tried was an IBM PC. Then we got a second-hand Amiga 500. My main computer before I moved to Oslo in 1997 was the Amiga 1200 with the Miami TCP/IP stack. Then, a friend helped me build an IBM-compatible PC that ran the Linux-based operating system distribution known as Red Hat Linux for years. Then I switched to Debian. Debian GNU/Linux, a free operating system. Then I got Ubuntu, based on Debian GNU/Linux. These days I run Fedora on my main laptop and Ubuntu on my second laptop.
I never really tried the Macintosh before entering University of Oslo. It ran NCSA Mosaic and NCSA telnet, but I had to reboot that computer quite often.
I just tried MacBook Air with OS X from Apple Computer.
I am quite satisfied with it. Mac OS X boots very fast, it is somewhat stable (almost as stable as the Linux kernel, as far as I know), but the operating system sometimes runs out of memory. Adding more memory to the machine is possible with the correct screwdrivers, but warrants the guarantee, so unlike a computer from say Lenovo or Toshiba, you can’t just add more memory to the MacBook Air as easy. The MacBook Air is both proprietary hardware and proprietary software.
When the proprietary Mac OS X software runs out of memory, it opens a window that asks whether I want to close any running programs.
A reboot usually fixes the problem. I am used to reboot computers running real operating systems like Linux on hardware and kernel upgrades, however, the MacBook Air with Mac OS X still needs to be rebooted quite often compared to the non-Macintosh computers I have tried.