The J&J vaccine might have been OK. We'll probably never know because they took the responsible step of pausing.

To clarify, one could argue that J&J shouldn't have been authorized as well, not having completed Phase 3 trials. But aside from that, all else being equal, it holds, or held, great promise because it was a one-shot vaccine that could be stored in a refrigerator, providing a huge benefit to impoverished or otherwise poorly equipped populations.

It's odd that AZ is getting so much international media attention, but it is the one getting passed off to countries in need, of course.