The 1-171825-0: It's a board-to-cable/wire style, meaning it terminates to a PCB and mates with a cable-side receptacle. The single wall shroud guides the mating connector, and the latch holder locks it in place — no accidental pull-offs in a panel that sees routine vibration. The tin-on-tin contact finish (31.5µin both mating and post) is fine for moderate mating cycles; if you're building a harness that gets reconnected weekly, gold would be a better bet, but for a one-and-done assembly this holds up.
The brass contacts are square pins, tin plated on both the mating end and the solder tail.