These mortgage REITs both pay big-time dividends.AGNC Investment (AGNC -1.08%) and Starwood Property Trust (STWD 0.10%) are two of the largest real estate investment trusts (REITs) focused on investing in mortgages. AGNC is the second-largest home financing REIT with a market cap of more than $9 billion. Meanwhile, Starwood leads commercial financing REITs with its over$7 billion market cap. Both mortgage REITs offer high-yield dividends. AGNC's yield is 14%, while Starwood's is 9.4%. Here's a look at whic ...