To me its Steem. It has number of advantages over other alt coin.
First of all it has no transaction fee.
If the price is not increasing, one can still make profit out of it through Steem Power.
You can power up and earn income.
You have also option to delegate your Steem power and earn from it.
At the price of Steem is on the lower side, so one can take benefit of it.
It has lot of potential and even after HF20 more people will jump into it and price may increase.