That's an extremely hard decision to make from those two guys. With the way your team is set up, you'd probably want Mays starting in CF because his defensive prowess would make up for any deficiencies caused by Williams and Ruth. However, Cobb was considered to be an incredible defensive player during his era, second only to Tris Speaker. On the other hand, with the amount of brute sluggers on your team, you might want a higher OBP and baserunning wizard like Cobb on your team. Imagine a lineup with Cobb (48 steals on average), Morgan (42 steals), and Wagner (42 steals). Like I said though, it's really an impossible choice because you really couldn't go wrong with either of them.