While you are technically correct - the best type of correct - the encrypted data should be indistinguishable from random data. If it’s not, you need better cryptography, as pointed out by the sibling comments.
Actually, it's not that simple. Read my response above.
You can't really say indistinguishability makes one cryptosystem better than another because it prevents distinguishing attacks because for some applications it's both not needed and computationally expensive.
