I totaly use NXT because it's inovative.
I don't like clones, because they are not much different than their original.
The first thing I liked about NXT is that all the wallets are stored on the blockchain, so I don't have to worry about losing my wallet due to loss of data or server theft.
Development team is working non-stop on new features and updates.
Feature I like the most is the Multigateway, it's a crypto-exchange that is mostly decentralised and probably the safest exchange out there so far.
To be honest, the only thing I don't like about NXT is the proof of stake, because NXT will always have the tendency to move towards the big piles,
it doesn't have the tendency to balance itself between the users.