A dumbbell will generally require more strength than a barbell. Once you push up a barbell it balances out but with a dumbbell you have to keep it balanced the whole time which requires more strength. One is not "better" than another, just different. Do both if you can.
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In some respects, dumbbells are better than barbells for Weightlifting. The chief reason is that, unlike dumbbells, using a barbell will enable you to do slightly more of the work with one side of your body. If you are right-handed and using two dumbbells instead of a barbell, your right side cannot help your left side raise the weight.
On the other hand, dumbbells have disadvantages, too. For example, they are harder to balance than using a barbell. In addition, getting into and out of position with heavy dumbbells is more dangerous than with a barbell. Therefore, the best way is the traditional way: use dumbbells and a barbell.
Both are great exercises. Both stimulate the growth of the muscle mass in your biceps very well. It is hard to define which one is better - it is more of a preference question on which one you like more. Both do their job equally well.
Dumbbells are better than machines because on most machines you are sitting or lying down . With dumbbells you are standing which tightens your muscles .