I use Astropixel Processor for stacking, Channel separation of dual band filters, colour Recombination under various ways the menu allows for 10 different variations of recombination.
I make star masks in Photoshop using the new plugin Star exterminator which will remove stars then in a separate layer you can subtract the nebulosity to create a star mask which you can then recombine using the colour dodge layer to re-add the stars after working on the starless image.
I have dabbled in Pixinsight but found it hurt my brain too much.
Siril shows some promise but as for startools, unless you have a decent computer it runs like a slug, not sure about the latest versions but it was way too slow for my mac.
Use whatever you feel comfortable, there is not one size fits all solution.
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