Each ETF generates income using a covered-call strategy. The ETFs pay much more than traditional income funds but are more volatile.

As long as the U.S. economy is going to grow, we should have some exposure to the Russell 2000 where its components are heavily weighted to the domestic economy. What I see delivering annual yields above 10% is using well-executed covered calls.

Each ETF is judged against the other in key categories like cost, exposure strategy, performance, yield, and a mystery category.