The Tarkovsky version is fantastic, definitely find time to watch it. It's visually stunning. Kurosawa wrote about how much he aesthetically loved Solaris, particularly the way Tarkovsky captured water.
Word of warning: do not expect Star Wars or Inception type special effects. And this is Tarksovky's reading which, if you know Tarkovsky, he was concerned more about the human condition, than technological aspects of Sci-Fi.
