Yeah, if we get Torres then screw Zlatan, indeed.
In short term there won't be any difference between the two and maybe Zlatan will be better.
Afterall, we're not playing in CL next year (hope we will), Zlatan knows serie A and this league fits Zlatan.
But the age difference, the fact that football develops in such a way where there is less space for static players and the fact that Torres is a better goalscorer, makes the Spaniard the better option.