Mexico - GBP pounds or US dollars?

with the current excellent exchange rate, is it better to change any holiday money for Mexico into US dollars and bring those into the country or is it better to simply bring British pounds and exchange over there. i have heard that the exchange rates in Mexico are generally favourable. going to be in the... show more with the current excellent exchange rate, is it better to change any holiday money for Mexico into US dollars and bring those into the country or is it better to simply bring British pounds and exchange over there.

i have heard that the exchange rates in Mexico are generally favourable. going to be in the cancun area, so it should be rather tourist friendly >?

thanks
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