I’m going to get a holiday travel money card and was wondering which was the best currency to add on it
Mexican pesos or US Dollars ?
Pesos...why pay the exchange twice?
Your money will go further if you use pesos and if you have to do a money exchange transaction, then just stick with pesos.
However, if you happen to have US dollars lying around that you want to use up, they are widely accepted in the tourist areas for tipping and spending. I'd avoid using them for taxis though as cabbies give a really lousy exchange rate.
I would not get a card , get cash , pesos , or use an atm there to get cash . Many places won’t take those cards