Even through Keycloak is more mature than ORY ecosystem I went with the latter as I have more experience with Go than Java. I'm only writing integration, dashboard. When those thing are ready I'm going to open source and offer a free option until I add billing, at that point you can either go on-premise or just continue with us.
Ory will probably offer a cloud service in the near future but I'm just scratching an itch for now.
If you know your way around it, Keycloak is good. But it seems quite easy to get into some paint points. I was using it recently and accidentally sent something that wasn't valid JSON. Instead of a 400 return code with some kind of message you get a 500 and the server coughs up a giant stack trace.
Ory will probably offer a cloud service in the near future but I'm just scratching an itch for now.