I found that research from Bank of America supports WisdomTree's conclusion. The highest Sharpe Ratio among the five dividend groups is decidedly Quintile 2. Right now, that group of stocks yields from 2.46% to 3.49%, according to BofA. Performance-wise, Quintile 2 has beaten the Russell 1000 equal-weight index over the 3- and 5-year periods and since tracking began in 2010.