Sequential Menu (Drill down) or Accordion

I have 3 levels in my information architecture for my desktop dashboard. In the vertical navigation which measures H:500px W:200px I have;

  • Top level: 8 items
  • Second level: 9 items in total (one of my top level item has 7 second levels)
  • Third level: 12 items

Would you use an accordion style (which will make the menu long when expanded) or a sequential drill down menu? and why?

Cheers,

Chris

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