Linux or BSD is where it's at for hackers. MacOS is nice too, of course, it's simple enough that my mom can use it. Just that if you really want to be in control of things, you probably want Linux. If I had to do sales or something else where looking flashy was important, I guess that would be another place where Apple's very nice looking products would be a good pick, but Dell+Ubuntu is a much better price/performance bet for someone who just wants to hack, a lot, and enjoys the freedom and control that come with free software. Admittedly, not for everyone, but then again, this site is for hackers, right?.