Blackcoin - no premine, fair distribution, POS stage, low inflation 1%, BC Multipool, and above else Community backers. Join IRC ##blackcoin & #blackcoinpool (most active here).
DRK is much better in the Black vs Dark coin care.The names have similar meanings though.
Both BC & DRK still have some many growth going imo, DRK with the anon darksend feature & BC would be added in www.vaultofsatoshi.com and www.kraken.com (TBC but in progress).
Among other else is both have good dev's and community
