“Baseball-Reference suggests that based in the parks they play in, you'd score ten percent more runs in all of Cabrera’s games than in all of Trout’s games. That ten percent is enormous. Baseball Reference has Cabrera as having created 145 runs, and Trout as 130 runs. A ten percent change will close that gap to almost nothing.”
And that’s why Mike Trout leads in WAR. While Cabrera leads in the raw numbers Trout plays in a tougher run-scoring environment. After all the adjustments are made, Baseball Reference has Trout being 54 runs above average, and Cabrera being worth 50 runs above average. When you add in the replacement level runs (same for both) and convert it to Wins Above Replacement, this is what you end up with, at least for today: