Macs and Windows
Working as an IT tech for over 10 years in a middle school I find that both can be a pain in the butt. We have iMacs, Macbook pro laptops, Dell Lattitude series laptops of various models. We also have Dell Optiplex desktop workstations. Of all these the most reliable by far are the Dell desktops. In the 8 years we have had them only 4 have gone out for outright failures such as a bad hdd or power supply. Otherwise it has just been occasional re-imaging and a switch over to Windows 7. The Dell laptops aren't bad either but more of those go out for repair for things like damaged LCD screens and keyboard spills and the ocassional system board issue.
The Macs have had there issues too, especially the Macbook Pro's and the OSX 10.6-10.8 operating systems. The Macbook Pro laptops have suffered the most issues with the vast majority of them needing to be sent out for power supply cable's with the magnetic ends breaking off, faulty keyboards and system boards and the famous no power problem despite being charged up all night. The Macs also do not play very well with either Novell or Active Directory and the Mac server goes down twice as often as the Windows servers. I have also gone through a total of 3 iMacs since 2007 with the past 2 suffering from failed hdd's. My current iMac with OSX 10.8 is suffering from an unresponsive internet lockup issue that nobody has yet been able to resolve leading me to believe that the same issues with 10.6 carried over to 10.8. I'm going to try upgrading to 10.9.5 to see if this problem still occurs. Google searching this issue finds many others with these same issues. Using Chrome, Firefox or Safari all produces the same result.
Windows can be a pain also with the lovely genuine advantage anti-piracy system flashing up telling the user that there operating system may be counterfeit. Then there are the Windows profile issues and I could go on. The point here being that neither is without it's faults. When I ask a tech or admin staff which they prefer they almost always answer that both have there issues and 6 guys might prefer Apple and another 6 could say Windows so it goes without saying.