PixelBob on Nostr: Meshtastic definitely has the largest user base. Meshcore is growing fast but still ...

Meshtastic definitely has the largest user base. Meshcore is growing fast but still small, and unknown if it has enough to steal meshtastics thunder. Reticulum very small, probably < 1000 nodes.

As for bridging, not sure. They each have a form of bridging over clearnet built in.