1. Windows
1.1. Pros
1.1.1. will support the power-savvy ARM chips found in phones and tablets, in addition to the Intel and AMD chips that have traditionally powered Windows PCs.
1.1.2. Boost quickly,in about 8-12 sec.
1.2. Cons
1.2.1. Tends to be a pure pain and you can get a run around when talking about the simplest of things.
1.2.2. Too little, too late for the smartphone/tablet market.
2. Ubuntu
2.1. Pros
2.1.1. Free and open source
2.1.2. An enormous free software library
2.2. Cons
2.2.1. Parts of it feel a little sluggish from time to time to time
2.2.2. Ubuntu is straight forward on how it works (if you know coding).
3. Mac O S
3.1. Pros
3.1.1. Cloud storage built up
3.1.2. A dedicated app for brosing and buying games
3.2. Cons
3.2.1. OS vendor can make radical changes at the drop of a hat that can adversely effect your entire business model.
3.2.2. OS X requires you to buy these basic applications to do every day task.