Personally, I like to use DSS for stacking astro images as it is less computer resource required, faster, more simply and some advantages over PI. However, when stacking very wide field images such as milky way or too much stars in the image, some issues come out with the result. Maybe just my fault that I don't know how to set the parameters in DSS correctly when using it to stack milky way images.
Using PI, no such an issue will come out.
DSS vs PI
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