Looking at it realistically, the Destroy is superior to the Psyco in just about every way. It's better armed, and is equipped with positron reflectors that nullify all of the Psyco Gundam's weapons.
However, if it came down to a simple no-holds beatdown as depicted above, THEN things would be a little more equal.
What if Psyc(h)o Gundam had a shrink ray, and could shrink Gunbunster down to her and Destroy's size so they could have a fair fight?! I think it would be fairer that way, Gunbunster is such a busta, she need to learn to fight fair once in a while.