In sports debates, the final argument is simply the scoreboard. You can throw out all the stats and superlatives that you want about a player or team, but what it really comes down to is the scoreboard -- who won? When it comes to rating exchange-traded funds (ETFs), the same argument largely holds up. I can throw earnings and ratios and percentages and all the advanced fundamental and technical stats in the world at you, but the one that matters most is returns -- how it has performed relative to its peers over the long term. That's not to say it will continue to perform at that level. Past performance is no guarantee of future results, as the disclaimer goes. Determining whether an ETF will be a good investment in the future does often depend on its key metrics, the market, the economy, the industry, how it's managed, and if it has certain screens or factors, among other criteria.
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