Just as this english team has to prove that they can win in the subcontinent.India have to prove they can win away from home..India will never be regarded as a great team is they continue to flop away from home.
I dont think either of IND or ENG are great teams- there arnt that many great teams in history of the game.
But inorder to be considered a great team, one has to succeed both inside and outside the subcontinent.
And i knwo that IND are strong at home ( though they have slipped in the past few seasons from their perch) which is why i think that a simple victory for IND wont do.
Assuming that ENG doesnt humiliate itself in the ashes,
If ENG wins in IND or draws the series, i would say that ENG is superior.
If ENG loses narrowly, it will again boil down to their record vs OZ and the rest
If ENG gets decimated, i would say that IND is superior.