It depends on what the stats are for it and what you think is better.
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Shadow is suppose to be stronger and faster But I like Sonic better.
its a pixel attack. doesnt exist goddamnit.
Well Mephies chaos control is kind of the same to Shadow's chaos control also he is like a shadow of Shadow's. So the answer is yes Shadow is stronger because he has more attack and he has more forms.
Yes all ghost type moves are physical attacks.
Shadow was created by Eggman's grandfather, Jerald Robotnik. The reason he created Shadow was to protect the world from the return of an all powerful alien (Shadow the Hedehog the game) Jerald's neice Maria died in the attack on the lab where Shadow was made and her dying words were along the lines of "give the humans a chance, a chance to be happy." So Shadow tries to save the word because Maria told him to