If you're going by postseason numbers....
Martin 60 wRC+, 10.3 BB%, 24.1 K% in 29 PA
Navarro -17 wRC+, 7.7 BB%, 30.8 K% in 13 PA
Or reg season:
Martin 114 wRC+, 10.5 BB%, 20.9 K% in 507 PA
Navarro 84 wRC+, 8.9 BB%, 15.1 K% in 192 PA
Or Steamer projections:
Martin 105 wRC+, 10.9 BB%, 20.7 K%
Navarro 95 wRC+, 7.0 BB%, 15.9 K%
Whatever method you choose to use, the answer is Martin, and that's ignoring his superior defense.