How do I choose between a moisture-proof cabinet and a nitrogen cabinet?

Choose by what actually damages the part. A moisture-proof cabinet (YSM) controls humidity, which is enough for the great majority of storage: components, PCBs, optics and general stock all degrade mainly because of moisture. A nitrogen cabinet (YSN) additionally displaces oxygen with nitrogen, which matters when the failure mode is oxidation rather than damp — bare metals, solder pastes, powders and some semiconductor materials. Both series share the same chassis, shelf ratings and ESD option, so the decision is about atmosphere, not build quality. If you are unsure, tell us the material and the failure you are trying to prevent and we will confirm which atmosphere it needs.