The efficacy rates are not comparable. My understanding is that, compared to the Moderna and Pfizer vaccines, J&J was tested on a more diverse population with respect to age and location, and also tested later, so that it faced more variants of the virus.
Get whatever vaccine you can.
(Disclaimer: I got the J&J vaccine two weeks ago.)
Get whatever vaccine you can.
(Disclaimer: I got the J&J vaccine two weeks ago.)