Kie integration seems to be more powerful when using Spring.

For example, you can defined KieModule using RelesaeId and you can even enable KieScanner
https://github.com/droolsjbpm/droolsjbpm-integration/blob/6.2.x/kie-spring/src/main/resources/org/kie/spring/kie-spring-6.0.0.xsd#L495

This is not possible when using Blueprint
https://github.com/droolsjbpm/droolsjbpm-integration/blob/master/kie-aries-blueprint/src/main/resources/org/kie/aries/blueprint/kie-aries-blueprint.xsd

The 2 implementations have to be functionally equivalent.