Which type of Kaal Sarp Dosh is the most severe?

Kulik Kaal Sarp Dosh (Rahu in 2nd, Ketu in 8th) and Takshak Kaal Sarp Dosh (Rahu in 7th, Ketu in 1st) are generally considered the most challenging. Kulik affects wealth and health most severely, while Takshak most affects marriage and partnerships. However, severity is never determined by type alone — the strength of the planets within the enclosed arc and the Mahadasha running all modify the intensity.