BlackCoin, because NXT was a good idea ruined by the worst distribution in the history of crypto.
Blackcoin's distribution was terrible...it was instamined. BC had a 1-week distribution period where 99% of the money supply was instamined by the creators who paid to rent out all of the hashpower and mine all of the coins, then since they controlled almost the entire money supply they traded back and forth with themselves pumping the price and trading volume.
Mintcoin actually has the best distribution of these style coins as it was released first, and was the most profitable coin to mine while it was still mineable, has already great merchant adoption. Don't be fooled by the pump and dumps.
I heard the devs of blackcoin actually rented a 1TH farm to instamine over
81 million coins. That's not to mention the premine they got and never did any community projects with. I'm definitely backing Mint as its economics are superior in every way. I mean, what would you want: 20% more coins in interest per year or 1% more coins per year? Mintcoin is the future. Just look at those charts, investors love the Mint!