Arteta 06-09 was immense.
Schneiderlin is class. Oozes it.
Although they have do have similar elements to their play, a direct comparison of the two as made by some isn't a fair comparison.
As you mention, there's no doubt that Arteta in his heyday was a creative dream and ran our midfield through his creativity and flair.
Morgan perhaps doesn't have that flair, but his reading of the game and positioning is terrific and he controls the tempo in a different way.
It's subtle but effective; there's no panache about his game but rather he does an awful lot in a very discrete way that's to some unnoticeable.
When he plays however, all the players in front of him have far more license to be creative and those behind him can rely on a lot of support.