It’s all about weight distribution. Their design allows for different movements because of how you hold them. Dumbells are one hand, kettlebells both. For instance you can use dumbbells for curls or a bench press. With kettlebells you can do a kettlebell swing or a goblet squat.
Different movements have different effects depending on which muscles you use and your motion. But you can’t really say one is better than the other, just different. They can be used together for a more balanced workout, again depending on your goals and priorities.
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