If it's up to me, I take a strong hiter who gives me a decent outfield glove, vs. a third first-baseman or a third DH (when the current Rules of the Game allow playing only one at either position.) What was Gomez's slash line for the 2H of the season, vs Napoli's? And, how old is he vs. Mountain Mike?
The only factors I can't account for are
a) Does Napoli hafve a hankering to suit up for Scott 'n' Jerry, in the PacNW (while Carlos prefers to ply his trade closer to the Caribbean)? Although I'd guess the presence of such Dominican leaders as Cano and Cruz in the clubhouse would make it all the mroe attractive for yourn Carlos.
b) Do Napoli's leadership skills products a WAR or two by themselves, that make up for his outfield inflexibility and his increasing age?
All that considered- strictly on the basis of what happens "between the lines", I'd vote for CarGo over Mighty Mike.