0402 obviously is harder to hand assemble. If you need to get them assembled by machine, please notice the following tips.
Z drugiej strony, some properties, like lead inductance, is lower. Dodatkowo, sometimes you can put capacitors right at the chip pins for QFP style packages, while routing signals underneath the chip. In effect, the loop area for the decoupling capacitor is much much smaller than a larger size capacitor, which may be placed further away to comply with signal routing.
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