That Trout is a CF and Betts is a RF is part of the difference. (Two runs worth.) Most of the difference in defensive ability these days is based in a player's range. Errors are so rare that they don't make much difference. So far this year Trout has been a better fielder than Betts. His defense has saved about three runs more than Betts' has. (To find this look for Rfield on a player's baseball-reference page.)
But also, remember that 0.6 WAR is not much of a difference, and that it's early enough in the season that our final defensive numbers will likely look very different than these.
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