These two systems trade image quality for speed and simplicity.

A multi-shot system like the Gigapan generally produces much higher-quality panoramas. By stitching multiple frames, you can create very high-resolution images suitable for large prints or deep zooming. It can also produce a true 360x180 spherical panorama when set up properly.

A single-shot mirror system is easier to use because everything is captured at once: no nodal-point alignment, and no matching of exposure, focus, or white balance across frames. It also avoids stitching errors and works better if there is motion in the scene.

The downside is lower image quality. A mirror-based system uses only part of the sensor to capture the whole scene, so resolution is limited, and image quality depends heavily on the mirror. It also may not capture a full sphere; one answer notes about 360x120 coverage, which is more limiting.

So: for best quality in interior panos, the stitched multi-shot approach wins. For quickest, simplest capture—especially with moving subjects—the single-shot system is easier. Many pano shooters instead use a panoramic head with an ultrawide or fisheye lens to reduce the number of shots while keeping high quality.