UOB Visa Card

NZD -> MYR

Transaction Date :
30/6/11 : NZD 40 -> MYR 102.73, Rate : 2.56825, Visa Rate : 2.505586
2/7/11 : NZD300 -> MYR 765.22, Rate : 2.55073, Visa Rate : 2.488534
17/7/11 : NZD88.68 -> MYR 230.55, Rate : 2.59980, Visa Rate : 2.536382

UOB Visa card has consistently charged 2.5% Fees on top of the Visa Corporate Rate on http://corporate.visa.com/pd/consumer_serv...er_ex_rates.jsp


My question :
Which daily foreign exchange rate is better, Visa Card or Master Card (without considering the additional admin fees imposed by the banks) ?