It depends on what kind of exercise you focus on.
If your goal is to build muscles like bulk-up, choose heavy weight.
If your goal is to build small muscles, you can choose a light one.
In addition to your opinion...
When you work out, you usually do 1 set 15 times and do 3 sets.
If you are forced to do 15 times, you can think of it as the goal of bulk-up.
If you do it 15 times, it's a way to build small muscles.
If it's your first time working out, it's better to use your own weight rather than weight exercise.
You use weights like dumbbells because you can't limit your muscles anymore with your weight.
If you're a beginner, it's much more important to exercise safely and get your inner muscles or body shape, so it's better to focus on exercise using your weight.
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