I started out using DSS but now use APP for most of my stacking. It is simply the easiest and quickest to use. APP is also brilliant at mosaics and very useful when stacking the multitude of stacked images produced by different scopes from  the BAT. However I also use Pixinsight to stack OSC data (aka colour data) because Gary Palmer told me that Pixinsight handles colour data with all its annoying bayer patterns better than both APP and DSS. Apparently Sequator handles colour data very well too but looses out over DSS in terms of sharpness.

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For planetary and lunar and solar stacking I use Autostakkert. Tis basically great but data that isn't great can be quite hard to stack. You might need to clean up your movie through PIPP  if autostakkert isn't working and then try autostakkert again.

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I've never used SIRIL.

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