If you mean human spaceflight, current Boeing has less experience flying humans to anywhere in space than SpaceX, let alone beyond low earth orbit. If you mean general spaceflight, SpaceX has launched more lunar and interplanetary payloads than Boeing has in the past decade or two.

Boeing and its proponents love to talk about things like "spaceflight heritage", but none of that means anything when most if not all of those employees are gone and nothing was done to transfer the knowledge.