More performance, due to less fees - an index will, over the long term, always produce a higher return than the vast majority of traditional funds. Statistically, the chance of a traditional, active fund manager beating their benchmark three years on the trot is just 4%. This is in part due to the fact that the more a fund manager charges, the more the client loses. The fees within ETFs are much less. The average ETF charges just a third of the typical unit trust. By paying 0.5% a year rather than 1.5% a year would save an investor 10.5% of their capital over 10 years.