Okular and Evince are two excellent, versatile PDF viewers for the Linux platform. The big difference between the two rests in the interface. Evince has a much simpler design. Okular is more focused on a graphical view. If all you do is view documents, then either of these two programs will serve your needs well.
However, if you need to add notes for presentations or collaborative projects, Evince comes up a bit short.

One of the hallmarks of using the Linux operating system is the ability to choose. The choices do not end with opting not to use Microsoft (Nasdaq: MSFT) Windows or Mac OS X and instead choosing from among dozens of Linux distros. You also get the freedom to decide which individual software tools and applications are the best fit for your daily routine.

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