International fee vs. currency change

[ModMC]

Which is the best/cost effective option? Changing my primary currency or paying the international transaction fees? I dont want to lose more money than I need to so Im not sure which is the smartest way to go. Im assuming changing the primary currency on my account/cards. Please advise!

[DPCreations]

Why not just use your local currency?

If you accept your local currency you don't need to be concerned about currency exchange rates.

[ModMC]

My local currency is USD but I am traveling to Europe so I will be charged international transaction fees when I make purchases abroad.