If you let go of two balloons, one filled with a vacuum and one filled with regular air, and release them at the same time, the balloon filled with regular air will rise faster. The reason for this is that the balloon filled with air has a greater mass than the balloon filled with a vacuum.
When a balloon is filled with air, the air molecules inside the balloon have mass, which contributes to the overall weight of the balloon. This added weight makes the balloon slightly heavier than the balloon filled with a vacuum, causing it to experience a greater gravitational force. As a result, the balloon filled with air will accelerate upwards faster than the balloon filled with a vacuum.
However, it's important to note that neither balloon will reach outer space. Outer space begins approximately 100 kilometers (62 miles) above the Earth's surface, at a region known as the Kármán line. Balloons, regardless of their contents, do not have the capability to reach such high altitudes. As the balloons rise higher into the atmosphere, the air pressure decreases, causing the balloons to expand. Eventually, the balloons will reach an altitude where the surrounding air pressure matches the pressure inside the balloon, and they will stop rising.