Extraordinary Size

Hey anyone... who is bigger in size? Primal Monitor or Yog-Sothoth true form? or they are the same size? Is there any beings larger than them?

Don't know who either of the characters you mention are, and I don't know the size of either one.
If you like that sort of thing, however, you might enjoy the following thread:

http://www.killermovies.com/forums/showthread.php?threadid=566872&pagenumber=1

Soul-Eater
http://www.marvunapp.com/Appendix/souleate.htm

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Infinity (Odin dark-self)