I would have to go with Mo Vaughn vs Albert Belle as the one that sticks out in my mind from recent years.
Belle put up great numbers in a strike shortened season in 1995
.317 50 HOMERS and 126 rbis and a 1.091 OPS in only 143 games
and his Indians won 100 games that short year.
But he was...and as an asshole.
The writers went with, at the time mind you, a fan friendly choice of Mo Vaughn.
Who also put up great numbers
.300 39 homers and also 126 rbis and a .963 OPS in 140 games