Oh Man!
Spain or Argentina? HARD
Teaching or Sales? (Well that one is easy, but when you factor in location, you are right back where you started)
That decision would have me sleepless for nights! Good Luck with it!
Btw, which accent do you prefer, the sing-song Italian sounding accent of Argentina, or the lovely Andaluz (you were in Sevilla, right?) ?
Oh also, what would you prefer: Steak and \"Malbec\" or Paella and \"Rioja\" (or what is it they drink in Valencia? Agua de Valencia, I forget! some sore of chanpangne concoction)
Not only location and profession but there is so much more to consider as well: Accents / Food and probably a lot more!
Follow your heart! (if that helps)