I've played with DBOS and like it, but I have to say the lack of a control plane and UI in the open source version means it may have a hard time competing with Temporal, which provides both.

Being able to see the state of workflows and their histories is a key part of having an application in production. Without a control plane, my understanding is that DBOS can't offer the same kind of failure recovery as Temporal, though it's unclear to me how the "Transact" engine does this.

A big benefit that Temporal's architecture provides is separation of concerns. Temporal can coordinate workflows across many apps, whereas with DBOS each app (as far as I understand it, at least) is a silo managing its own queues.