Cloak ofcourse and not DARK. This is pretty simple, because DRK uses the nodes and since nodes can be manipulated it is NOT 100% decentral, hence not completely anonymous.
CLOAK PoSA however is the first coin that is completely decentral anonymous.
You seem like a real expert. Could you explain this PoSA with your own words, and also how it combats Sybil attacks, eavesdropping, and blockchain bloat, thanks!