The 2355172-6: The 2.00 mm pitch (0.079") sets a compact board footprint — 0.394" (10.00 mm) total row width for 6 positions. Through-hole solder termination provides mechanical strength for the connector body; the square 0.025" (0.64 mm) pin cross-section suits standard 0.032" (0.81 mm) plated-through holes.
Peer Comparison: 1376779-2
The key difference: 1376779-2 carries a thicker gold mating finish (8.00 µinch vs 3.94 µinch) and a higher current rating (3 A vs 2 A). If your application demands more mating cycles or a slightly higher current margin, 1376779-2 is the upgrade path — same footprint, same pinout.