Use revolut in czh

Hi, i want to know wich metod is better when we Travel, it’s better to use revolut main portfolio and pay with it or create portfolio with country’s currency ?

You presumably mean the Czech Republic, right? In that case we’d be talking about CZK which is supported by Revolut. Now whether you exchange it beforehand or during a withdrawal does not matter for the exchange rate itself, however during the weekend there is a surcharge, so if you prefer to avoid that and might withdraw on the weekend it might be better to exchange it beforehand.