1. Create an additional partition with Boot Camp and every restart annoying when you want to use Windows ode rmuss.
2. use Windows in a virtual environment. This allows Parallels and applies with VMware for a few years as the best systems for it.
After installing Parallels can be there purely to install another system. Windows, Linux, older Mac versions, etc. For example, I one with Windows XP and one with a newer Windows (XP because Anstoss3 :)).
Will I use only one program, I often take the Chrystal mode where Parallels blurred with the normal Mac desktop. Not quite the latest 3D games also run well and better than the previous versions Parallels.
Criticism there are really only at the annoying charge policy every year. For pure occasional users that is too much money. Here might be a business and a home version desirable.
PS: The system to be emulated, you have to buy anyway.
4 stars