Tuvok. Both are quite intelligent and could probably excel in the role, but Tuvok's job actually has been in security/law enforcement for some time.
You are a civilian who finds themselves trapped on an alien world, forced to navigate your way through a jungle filled with both natural hazards and hostile humanoids of some sort, in order to reach safety. Your companion is one of the franchise's first officers. Who would you rather it be - Spock (TOS or Abrams), Riker, Kira, Chakotay, or T'Pol?