Combination of all is best I think.
I have a pre-paid card that I try to use for everything. I set a budget for the trip and stick that on the card, it's normally ran out a couple of days from home though
A few hundred quid of local cash spread around a bit is always good (I once packed a bag for a trip and found 150 euros in an inner pocket left from a trip the previous year....result!!)
I also have a couple of other credit cards just in case.
If you're travelling in a group, it can be useful if you have different cards; I've found that fuel pumps will reject one but accept another. We don't bother keeping tabs on who buys what during a trip we just sort it out when we get back. Saves trying to remember who's round it is for fuel, food,  .
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