Uh...
That's nice to know.
But you see, we are not talking about the supreme being in Vertigo.
We are talking about The Presence, the supreme being of DC.
For your info,
Elaine is the new supreme being of Vertigoverse. After YHWH gave him all his power to Elaine, she merged with the universe.
That's all we need to know.
Back on topic:
About The Source, it is NOT the supreme being of DC.
But it is an integral part of the DCU, for it is responsible in empowering and sustaining everything in DC.
If The Source is destroyed, there would be an opposing chain reaction that would cause the entire DCU to collapse.
The same cannot be said about THOTI.
Yes, I acknowledge the fact that THOTI is a force to be reckoned with but it is not a vital and integral part of the MU.
The MU sustains itself, even without THOTI.
Thus I conclude The Source > THOTI.
The Source is an aspect of The Presence.
The Presence against THOTI is spite in The Presence's favor.