The 7-338069-4: Tin-on-tin works well in benign environments; for repeated mating cycles or corrosive atmospheres, a gold-plated sibling would be the better call.
The friction lock engages on the header latch to resist vibration-induced disconnect; it's not a secondary TPA, so terminal retention relies on the crimp terminal's own lance in the housing cavity. Solder termination means the contacts are reflowed to the PCB pads — no crimping or wire stripping needed at the board end. The forked contact geometry provides a compliant beam that wipes the header pin on insertion, cleaning through light oxide films common in tin-plated interfaces.