Heyward or Posey for Rookie of the Year?

[Thisguy]

If you had to pick one of these for ROY, who would you pick?

Jason Heyward
G: 142
AB: 520
R: 83
H:144
2B: 29
3B: 5
HR:18
RBI: 72
BB: 91
K: 128
SB: 11
CS: 6
AVG: .277
OBP: .393
SLG: .456
OPS: .849

Buster Posey
G: 108
AB: 406
R: 58
H: 124
2B: 23
3B: 2
HR: 18
RBI: 67
BB: 30
K: 55
SB: 0
CS: 2
AVG: .305
OBP: .357
SLG: .505
OPS: .862