Pay in pesos vs Dollars

Can one of you econmics majors please clear something up for me I keep reading that if you are paid in dollars you are better off then if you are paid in pesos. If you are paid in the equivelent in pesos vs dollars what difference does it make? I found that inflation effects the dollar if the exchang rate remains the same. The exchange rate hase been the same now as it was in 2003. Sure if the peso is allowed to float then there is a built in hedge against inflation if you are paid in dollars, will the Christina administration allow that to happen?