When it asks "local or your currency", always pick local currency and refuse the ATM's 3%–7% markup.
Many foreign ATMs charge a fixed operator fee per withdrawal (often $2–$7), separate from your bank's. Withdraw larger amounts, fewer times.
Credit-card cash advances usually carry a fee and accrue interest from day one with no grace period. Prefer paying by card over cash advances.
Related: what is DCC · before you go.