Of the I prefer to visit from Private or Tor windows, there are none that I wish to also visit in a normal window. Bookmarking these sites is a small convenience but introduces a small hassle. I must always open the Private or Tor window before launching the bookmark. The process could be streamlined if the bookmarks provided an option to direct the link to always open in a Private or Tor session.
Fundamental to this recommendation: Each bookmark offers a setting that will direct the URL to always open in a default, Private or Tor Window.
Optional: Consider a slight UI change when presenting these bookmarks in the UI. Maybe tint the background light purple, or introduce a badge to the favicon signaling which kind of session the bookmark launches, or a thin glyph between the favicon and the bookmark title.