If you can only buy one of the two, the dumbbell stool is better. The supine board can be used for abdominal exercise. Dumbbell bench can also achieve the same effect, at the same time, you can also do various postures exercises of dumbbells, both chest muscles and back muscles can be practiced more comprehensively.

Let's say sit-ups. It's better to practice the lower abdominal muscles on the supine board, but the dumbbell stool can do leg lifts to fix the upper body and exercise the lower abdominal muscles, and the effect is the same. Dumbbells can also do flat belly tumbling. Generally speaking, dumbbell stool is better.