Regular users won't have to deal with or see Ardor. All the fancy Nxt features will be on Ignis.
And with a basic transaction fee of 10 Ardor, trading Ardor on-chain will be rather expensive.
10 Ardor as a transaction fee is high. For executing transaction in the blockchain, hodlers or rather forgers of Ardor will be making hay with this set up . So much profitable if you ask me.