Barbells can handle a lot more weight than a standard or loadable dumbbell, making them a better asset to improve or increase overall strength. There is nothing quite like the feeling of a bar in your hands, too, especially when pulling a 1rm off the floor!
Is it better to use dumbbell or barbell?
Both dumbbells and barbells allow for a wide range of exercises. A barbell is more suitable for heavy compound lifts, while dumbbells make it easier to isolate specific muscles. In general, you can use dumbbells for most exercises that would otherwise require a barbell.
Do you need a barbell to build muscle?
Because barbells allow us to load progressively heavier weights, and because we can safely lift in lower rep ranges, barbells are the standard piece of equipment for strength training. However, barbells are also fantastic for building muscle, and so they're equally great for bodybuilding.