I really didn't know a lot about the blood clotting, but the problem is real if uncommon.
From US CDC regarding J&J and blood clotting.
So if my math is correct, blood clotting occurrence is 0.0007% for women.
If comparing it to COVID19's fatality, it's a bit challenging due to age and what period of time under discussion and location. Depending on the above it been as low as less than 1% and has high as 73% but those are the extremes.
I found the following useful to illustrate what was being seen.
..reported infection fatality rates have varied. To get a better estimate, Brazeau and his team looked at 175 studies, finding just 10 they regarded as reliable. They adjusted for confounding factors and calculated the death rate for each age group, including 0 per cent for under 4, less than 0.1 per cent for people under 40, 0.36 per cent if 50 to 54, 2.17 if 70 to 74, 5 per cent if 80 to 84 and 16 per cent for those over 90.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7834220/
The article is from November 2020, so I don't believe that it takes into consideration the current COVID19 variants and new anti-viral treatments. However, it still illustrates that COVID19 is more lethal than the J&J vaccine.
The CDC has a useful table that I find compelling on why I should get vaccinated for I am trending towards the right side, i.e. old :). It can be found at
https://www.cdc.gov/coronavirus/2019-ncov/covid-data/investigations-discovery/hospitalization-death-by-age.html.