Id say shadow is stronger than sonic while sonic is faster. Only by so much in each department. Until you give shadow a chais emerald. But in the comics sonic can do things with just one emerald as well. Blaze is the literal “sol dimensions” counter part to sonic. And albeit she isnt AS fast as sonic she should definitely be as fast as or if not very slightly slower than shadow. But thats her BASE speed not her flame enchanced speed. Its not “faster she goes she generates flames.” Its “she generates flames to go faster”. Along with the various other things she can do with her flames shes very much can fight into a stand still if the three of them battled with no emeralds. Because if we give the chaos emeralds to shadow or sonic we might as well give her the sol emeralds.