I think the other reply captures most of it for core NATS, but we also looked at NATS Streaming a bit, but it seems to be pretty immature (though promising) and

I think the other reply captures most of it for core NATS, but we also looked at NATS Streaming a bit, but it seems to be pretty immature (though promising) and doesn't check all the boxes around integrations into the streaming ecosystem like Pulsar does (Pulsar functions, Pulsar IO). I am interested to see where NATS goes but for where we are today Pulsar was a much more obvious choice.