Ted Williams is the second best hitter ever
Now, both Ty Cobb and Ted Williams played in the outfield, Williams in left and Cobb featuring center an right. Here are their stats:
Stat, Cobb, Williams,
Hits, 4189, 2654
Home Runs, 117, 521
RBI, 1938, 1839
Runs, 2246, 1798
But most of the disparity can be attributed to the large amount of games Cobb played. I believe that Ty Cobb should be considered the second best hitter, if the not that first.