Should I buy a DIN or yoke regulator?

Dive mostly US boats and rentals: yoke keeps every fill simple. Buying once for worldwide use: DIN, plus a ~$30 yoke adapter in the save-a-dive kit — DIN captures the o-ring, handles higher pressures, and converts down easily. Converting yoke to DIN later is the expensive direction. Full decision table on our DIN-vs-yoke page.