Can I ask if you mean vaccine-induced thrombotic (blood clots) thrombocytopenia (low platelets) (VITT)? Aside from that, I’m aware of any diseases linked to vaccines in a causal manner though, but correct me if I am wrong. If you mean VITT, then I think Covid-19 is more risky and dangerous. After all, VITT is rare with a rate of <10 cases per million vaccine doses.