Lynn's 1975 season was a major reason the Red Sox won the AL East that season and though postseason stats do not count, Lynn was a major contributor to the Pennant that the Red Sox won that season. Trout led his team to 93 wins, which normally would have been enough to get the Angels into the postseason, especially with the expanded playoff format.
Trout played in less games, as Lynn had 145 to his 139, but had more ABs 559-528. Both players led the AL in runs scored, as Trout had 129 to Lynn's 103. Trout had more hits 182-175. Lynn led the AL in 2Bs with 47, as Trout had just 27. Trout had 8 3Bs to Lynn's 7. While Trout hit more HRs 30-21, Lynn had more RBIs, 105-83. Trout led the AL in SBs with 49, as Lynn (not a base stealer) had 10. Lynn had a slightly better batting average (.331-.326), on base percentage (.401-.399), slugging percentage (.566-.564) and OPS (.967-.963). Trout had the higher OPS+, as his 171 led the AL. Lynn finished at 162.
Trout was certainly more of the free swinger, striking out 139 times to Lynn's 90. Trout had more bases on balls (67-62). If I was comparing the two seasons, I would give the slight edge to Lynn because of the strikeout differential and the more extra base hits (75-65). Trout is the better defensive player but many forget Lynn played a very good defensive CF for his first couple seasons before moving to a corner OF position. And, both players won the Gold Glove in their rookie seasons.
Many people point to the defensive metrics to try to show that Trout was the better all around player this season. The MVP award has always been centered around the offensive production of a player. I don't feel it should change. It is commendable that many friends in the SABR world have put a lot of emphasis in defensive metrics. But, in the history of the league MVP awards, the award has historically gone to the league's best offensive player. While Trout clearly had a better 2012 defensive season than Cabrera, Cabrera had the better offensive season.