SFGADV is better than SFMM, but worse than Cedar Point.
Cedar Point is the king of all, amazing rides, great collection of flat rides. Perfect atmosphere for both enthusiast and family's, great kids areas. Well themed, and great looking. SFGADV does have quite a few things better while others are exceeded by Cedar Point.
I think SFGADV is better than SFMM because like CS says, SFMM concentrates too much on rollercoasters, not many kids rides, nor theming. While SFGADV does have decent theming and a much better looking park, there's both pros and cons of SFGADV.