|I have limited experience with Macs, but my impression with OS X is that installation and removal of programs is clean and easy.
Windows has some fairly kludgy concepts, which save a little space (ironic given the excessive bloat of most apps). Installation and removal is far from clean, and can lead to weird issues.
In general, a heavily used Windows machine gets worse and worse over time. The analogy I use is "free radicals". Stuff gets slow or starts acting weird. I suppose viruses may be an issue, but I don't get viruses. A clean install of windows and all the apps cleans it up. The time when that's needed seems to be when the computer is about 2-3 years old. Back in the day, I suppose that was fine, because it was time to get a new machine.
But I'm not ready to go Linux, which (to use Tom's analogy) is the kit car of operating systems. I just want to get stuff done. Windows and Mac both work fine.
Apple started out as very open. Perhaps that was the Woz's influence. I agree that they keep too much under wraps. I don't mind having a smooth, effortless vernier, but it's nice to be able to peel back the layers when something ain't right.