Key PointsState Street Financial Select Sector SPDR ETF manages $51.9 billion in assets under management (AUM), significantly more than the $2.2 billion held by Fidelity MSCI Financials Index ETF.While both charge an identical 0.08% expense ratio, Fidelity's ETF offers a broader portfolio of 386 holdings compared to 76 in the State Street fund.The Fidelity ETF provided a higher trailing-12-month dividend yield of 1.7% versus 1.5% for the State S…