Briar is definitely far superior. However, one major drawback is that it is not cross platform. This alone means it won't gain traction in the Hong Kong protests, unfortunately.

Briar looks very interesting, however it lacks the broadcast mode that Bridgefy has, which I suspect is a major feature for coordinating a protest.

It also lacks the ability to use existing contacts (you have to do a QR code exchange).

Still quite useless, because key exchange process is so badly designed. But they've promised to fix this in future.

Exactly this. I don't see any other solution that offers remotely near the same privacy that Briar does.