The whole of the space part of SpaceX is like 10% of the claimed business according to their S-1. And most of that is Starlink, not launches for third parties.

SpaceX's launch business is great, but does not justify the majority of the valuation.

We will see China comming up soon i would argue.

But otherwise yeah SpaceX one that one for now. Only issue with this: We don't have enough payload for SpaceX to expand that much more.

If you are asking for government and research needs rather than commercial then ISRO (Indian space research organization) beats SpaceX

That being said, ISRO focuses more on research and scientific world as compared to the commercial world but they were the least expensive option out there before SpaceX and the only differential which causes the pricing is actually re-usability aspect of SpaceX rockets/launchers and ISRO is actively working towards that too.

And another thing as brainwad said here but Space part of SpaceX is just 10% of the claimed business according to their S-1