well i tend to treat ETFs as insurance ( blanket sector/index coverage if you like )
personally i have a bias towards LICs and REITs ( compared to ETFs ) because your fund manager ( normally ) has a mandate and a strategy
now sure your manager will make poor choices from time to time ( just like when i stock-pick ) but the better ones have a strategy , and explain the portfolio moves and their perception of the market
whereas most ETFs ( that aren't actively managed ) use a reference index , an algorithm , and the computer does the rest with minimal errors , and as long as the market goes up everything is rosy ( and DRP participation helps as well )
now my best capital gain in an ETF has been ASIA ( so i took out the investment cash during a peak ) , my best performer ( for me , because i have sold down and bought extras later ) has been SYI
but interesting times are coming , i guess we will see what happens when the tide goes out ( investors can be very fickle )