It's more important than ever to be able to deliver the right information, to the right audience, in the right format, and at the right time. To do so may mean a unified toolset. The right information means pulling only relevant content. The right audience should be identified and targeted with content that is appropriate to their job and experience level. The right format could be a PDF for them to print, or help delivered to their smartphone, or more detailed online information on a tablet, or ideally in whatever medium they want. And the right time is when it's needed which includes being able to find the information.
Consider your full needs, not just one set of needs and then do your homework. Having an XML tool from one vendor, a video generation tool from a second, a publishing tool from a third vendor, and a graphics tool from a fourth may make sense if there are specialized needs that a unified toolset cannot meet, but that is no longer the case. More than one vendor offers tools that can meet all your needs. So why pick a unified toolset? There are several good reasons.
A unified toolset can: