1.The majority of Linux variants are available for free or at a much lower price than Microsoft Windows.

2.Linux is and has always been a very secure Operating System. Although it still can be attacked when compared to Windows, it much more secure.

3. The majority of Linux variants and versions are notoriously reliable and can often run for months and years without needing to be rebooted.

DISADVANTAGE OF LINUX :

1.Although the majority Linux variants have improved dramatically in ease of use, Windows is still much easier to use for new computer users.

2.Linux has a large variety of available software programs, utilities, and games. However, Windows has a much larger selection of available software.

3.Linux companies and hardware manufacturers have made great advancements in hardware support for Linux and today Linux will support most hardware devices. However, many companies still do not offer drivers or support for their hardware in Linux.

ADVANTAGE OF WINDOWS :

1.Microsoft has made several advancements and changes that have made it a much easier to use Operating System, and although arguably it may not be the easiest Operating System, it is still Easier than Linux.

2.Because of the large amount of Microsoft Windows users, there is a much larger selection of available software programs, utilities, and games for Windows.

3.Microsoft Windows includes its own help section, has vast amount of available online documentation and help, as well as books on each of the versions of Windows.

DISADVANTAGE OF WINDOWS :

1.Microsoft Windows can run between $50.00 – $150.00 US dollars per each license copy.

2.Although Microsoft Windows has made great improvements in reliability over the last few versions of Windows, it still cannot match the reliability of Linux.

3.Although Windows does have software programs, utilities, and games for free, the majority of the programs will cost anywhere between $20.00 – $200.00+ US dollars per copy.

4.Although Microsoft has made great improvements over the years with security on their Operating System, their Operating System continues to be the most vulnerable to viruses and other attacks.

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http://www.ehow.com/list_6325797_advantages-disadvantages-unix-operating-system.html

The Unix operating system

Advantage: Virtual Memory

The Unix operating system offers an efficient level of virtual memory. What this means for the user is that you can use a number of programs at the same time using only a modest level of physical memory. The system can handle several programs at once without severely pulling on the system’s resources.

Advantage: Toolbox

This operating system offers a rich collection of small utilities and commands that are designed to carry out specific tasks well rather than being cluttered up with a variety of special but insignificant options. Unix acts as a well-stocked toolbox rather than attempting to do everything at once.

Advantage: Customization

Unix has the ability to string different utilities and commands together in an unlimited number of configurations in order to accomplish a variety of complicated tasks. This operating system is not limited to any pre-configured menus or combinations as most ordinary personal computer systems normally are.

Advantage: Portability

Unix is available for use on a variety of different types of machines, making it one of the most portable operating systems in existence. Unix can be run on both PC and Macintosh computers and many other computing machines as well.

Disadvantage: Interface

The traditional interface for the Unix operating system is command line based, and this command line shell interface may be hostile to the casual user. Unix was developed for use by programmers and serious computer users rather than casual users. A graphical user interface (GUI) is also available, but the traditional Unix interface is command line only.

Disadvantage: Special Commands

Commands required by the command line interface often make use of cryptic naming schemes, and do not give much information to notify a user of what they are doing. Many commands in the Unix interface require the use of special characters. Small, normally insignificant typos can have much greater effects and unexpected results on Unix machines.

Disadvantage: Overwhelming to Novices

While the richness of utilities offered by Unix is a benefit or advantage to many, this may be overwhelming to a novice user. The Unix operating system is not simple by any means, and may be daunting and overwhelming to some users.

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http://answers.yahoo.com/question/index?qid=20080122140429AAWn4Iq

mac os

Advantages:

Easy to use

Virus free

With boot camp you can run XP or Vista on your machine, and with Parallels you can run windows programs in OS X

Disadvantages:

Small software base compared to Windows(with out useing bootcamp/parallels)

Not nearly as customizable

Missing some features that are pretty basic with Windows( my biggest hate is no page up/down key, no real backspace key, and you have to use the control key to right click)

Any more I would say that about any operating system you pick will work, I still prefer Windows Xp over everything, but Linux, OS X, and Windows are all great choices.

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Mac os

http://www.answerbag.com/q_view/685061

Advantages:

More Stable

More Dependable

More visually appealing

More user friendly & “just works”

Simplifies a lot of things

Less prone to virus, trojans, etc

Less prone to hardware issues

Disadvantages:

More pricey

Less control over your computer

Less software options

Less hardware options

Harder to personalize

Hardware issues are MUCH more severe when happens

More expensive software

My own words about mac

Advantages:

Almost 0% Virus

Un-often Crash

High Definition

Better And Useful Apps For Developers, Musicians, Photographer, Director, etc ( Like Adobe CS5 )

User-Friendly

Less Chemicals

More Battery Life

Compatible With Many USB Drivers, Music Interface, etc.

Has Better Free Applications ( Like Imovie, Iphoto, Garageband, IDVD, Iweb )

Unexpensive MAC OS X Software

More Advance Technology

Neat / Awesome Looking

Best Resolution For Mac 27″ ( Maybe the best resolution because it has Full HD or better. )

Disadvantage:

Expensive

Less Games, Applications

1 Huge Crash May Destroy Your Mac / Cause It To Freeze!

Difficult To Upgrade ( I think it deletes your file if you do not make a backup when you upgrade, so its like you will be needing to buy a new mac. )

Annoying Rotating Disk Ball ( When Refreshing or when your computer is busy. )

In my openion The best one is mac os