Quoting trubulator from a post yesterday: "I suggest you read the NMM prospectus, which spells it out very plainly. But a synopsis:
NMM: high dividend payout, owns capes and panas on 3+ year charters. Should be a source of steadily increasing high dividends.
NM: low payout, owns Handsizes, Supras, some panas and capes, does FFA trading, owns a port in S America, manages NMM. Should be a source of growth, but harder to figure out than NMM. "