Box is by far the most talked-about cloud content management and file sharing service in the ECM community. Indeed, legacy vendors see Box, though grudgingly at times, as the only serious cloud competitor to their more traditional ECM products.
In our analysis, what makes Egnyte stand out is its ability to provide a unified platform to govern data and files across both cloud and on-premises repositories, and to automate the analysis and governance of that information in one central place.
Over the past five years, Dropbox has taken enterprise requirements much more seriously. The current incarnation of the Dropbox Business platform is smart, easy to use, scalable, and well worth considering for any large and diverse enterprise content/collaboration situation.
What Citrix has done well is to build a niche for itself, targeting workers and enterprises that leverage multiple, fragmented applications and products, and delivering a platform that can intelligently unify otherwise awkward situations.