If you are asking about a problem you are experiencing, please use the following template, as it will help us help you. If you have a different problem, please delete all of this text 
Kibana version:
v7.6
Elasticsearch version:
v7.6
APM Server version:
v7.6
APM Agent language and version:
JAVA agent 1.13.0
I see the document of Public API and Elastic APM OpenTracing bridge .In my opinion, I think they are the same ,so Can you tell me the differences ? or they are suitable in different scenes ?