I've always been sort of a computer geek, and have used a whole variety of different operating systems for work, school, and just general entertainment. I've used pretty much the whole microsoft family (dos, windows 3.1/95/98/me/2000/XP/2003), a smackload of different unix-es (openbsd, freebsd, solaris, linux, etc), some oddball oses (beos, QNX, Nextstep), and the OLD Mac OS (think Mac Classic and older) but up until recently, I had never tried OS X.
I started with Linux back in the days of 486's. I ran slackware on my blazing fast 486 DX/2 50mhz. I spent hours and hours trying to get XFree configured (and succeeded!) I toyed around with it on and off for years, trying all sorts of different flavors. I was stuck on Mandrake for a while, then for a year or so, I went back to XP. For the last couple years, I've been using Ubuntu on my home machine exclusively. Compared to the old days, this distro is almost unbelievably easy. On my machine, everything just worked from the live CD. No configuring necessary. Automatic updates, Openoffice, Firefox, a variety of video players, and even some video games - it's a pretty tough act to beat.
Last week, I bought a Mac iBook. Honestly, I really intended to install Yellow Dog linux or maybe Xubuntu for Mac on it. But then I started playing around with OS X, in this case version 10.3 which came installed on my iBook. Here are some brief thoughts:
Overall, OS X is pretty sweet. It's easier to use than Ubuntu, and has more commercial apps. However, it also lacks a lot of features and noncommercial apps. Given the choice between OS X and Windows, the choice is obvious. Given the choice between OS X and Ubuntu, I'd probably still have to choose Ubuntu for the higher cool factor.