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Soderberghs version is much more reflective of what happened with the emergence of OpenSolaris and Illumos (not to give away any spoilers but apparently forking is a real thing and it lives on). Tarkovskys movie was such a philosophical drivel that I feel asleep. How is the book - is it worth reading? As I understood it neither of films follow the novel very closely.
The book is superb. But to appreciate the book have to understand that Lem, in his serious mode (he also wrote comedies and light-hearted adventures, which are quite different), is not very concerned about plot, nor about most things American sci-fi has always been about: There are no heroics, no politics, no space wars, no McGuffins, and there's only minimal world-building. Lem is an engaging writer, but also a some…
In a similar tone, I actually love the Tartovsky film. A very weird piece of work, and a hell of a thing to experience a few weeks before a summer spent in Russia...