Hi, first post here.
Windows, at least after Windows 7, which is the first stable and comfy version from start without 3rd party add-ons. Like the free choice on hardware components, and compatibility from version to version (99% of it, at least).
I have a machine with GRUUB installed to run Win 7, Ubuntu 10.10 and a Hacked version of Mac Os X 16.0 (couldn't upgrade it, since it´s a miracle after 150 trials I've made it work) on an Intel PC.
Win 7, runs, detects everything, and, to my point of view, runs smoothly on my core-duo.
I've tried several linux distros over my life. Red hat first, when you had to be a master of hardware to install even jumper configurations on Win 3.0, I've found it interesting, but very hard to the common users (I was 17 at the time). Later on I've tried Suse (unnappealing to me), and recently Kubuntu (unstable and awkward with sound drivers (!), Mandriva (their installer lags 5-8 years in plug and play terms) and Ubuntu 10.10, which for me it's nice, fast, and reliable if a bit spartan (Commpiz sucks, admit it, nice to play, but very unstable). Thing is, even if it lacks of the proper office package (say whatever you want: Open Office is subpar, period.) I love Linux philosophy, so I try to give them a try whenever I can, even if in the road to mastering it I'm always at 30%. I feel the same with Greenpeace: I love what their do, mostly, but don't have a tiniest clue of how really helping them if they would invite me to join them.
Testing of Hackingtosh doesn't count for Mac OS X. See, it's not integrated at all, had to deal with PC hardware and SCASI and S.M.A.R.T. capabilities, and so on. Incluiding sound, which I never made it work at all. Suprinsingly, it overclocks (sort of) my Pc when it runs... just to say that goes faster than on a Mac (yeah, right, believe me!) incluiding the motherborad clock... but there's also problems every time and then with thing the OS wasn't designed for.
Still, I've developed to things with Mac over the years, aside from their philosophy
Before Iphone, Macs were to me something of just to snob, but in a kind of geek wannabe way. Those guys opted for a Machine that had few problems (conceded), but where unable to share the tiniest doc with anyone else. then Apple collapsed and Microsoft went to save it on the last minute. Apple went underground to main stream news until the Iphone... Steve Jobs met Project Runway, Heidi Klum included, and Apple, with an admittedly well rounded product (which still I hate, gifted I would change it for something with Android Inside), started to be appealing for their sense of desing.
Let me apart myself a bit here: Desing, to me, its the 2010s bubble. People, in general, and fashion addicts, gourmets, but every segmen tof the market and Apple fans in particular) are paying and awesome figure in their products to get "desing". It's expensive, gives nothing really productive, except for the feeling that "I'm different, I own an ipad! Weel everybody has an Ipad now, but I've had it two month earlier than anybody else" thing. I'm no expert in life, and I clearly don't know what makes you different, but it's not your laptot, your I-pad, nor your cellphone.
They are, all "desings" manufacturers, smoke sellers, selling you something at bizarre prices just because it's has the merit of being expensive. Said it, I can't stop thinking that the authors of this economic aberration (http://www.luxurylaunches.com/other_stuff/worlds_most_expensive_ice_cream_for_1000.php), and the ones that consumes it, owns a machine with MAC OS X inside.
... and it doesn't run that smooth, nor it's particularly good (on a Mac), aside from the fact that you can't destroy it from control panel... less viruses are a good point to, but Linux all the way then.