Defensively, Trout was third among qualifying American League outfielders with a range factor of 2.48. He had a Defensive Wins Above Replacement of 0.9, which was not in the league’s top 10 and he had six Defensive Runs Saved.
However, for Arenado, he had a 2.98 range factor (which led qualifying third basemen) and a Defensive WAR of 2.3. He also had 20 Defensive Runs Saved.
Trout was an All-Star, he won the MVP award, and he was a Silver Slugger Award winner. Arenado was an All-Star, he came in 5th in the NL MVP voting, and he won a Silver Slugger Award, he won a Gold Glove, and he won the 2016 Wilson Defensive Player of the Year award
Trout had a WAR 10.5 and Arenado’s was only 6.6.
The numbers are, once again, close in the offensive numbers but Coors Field helps Arenado’s numbers so Trout is the better offensive player. However, if you just consider the production that they have and don’t consider the park played in, you have much more of a dilemma.