I got ZbrushCore because of the affordable price and because it does everything I need to do. I'm very happy with ZbrushCore but I have to confess that I'm already dreaming about upgrading to the full ZBrush version.
Zremesher and UV tools were the main tools I would use in zbrush. Regarding brushes I only ended up using 6-7 at most. Check the comparison chart to see before purchasing.
Zbrushcore definitely comes with what essentially is used often in sculpting and handles a large amount of polygons.
They emailed a code and the process took less than a day.