No nonsense, affordable astro software that just works.
Nevertheless the result can look quite pleasing when simply browsing past the image in a Facebook feed.
The 'Regularization' in StarTools is automatically set to a baseline that should yield a good balance between detail recovery and artefact/noise suppression.
The difference between 'Deep Space' and 'Lunar/Planetary' mode, is the way reconstructed highlights are treated.
You can convert everything you see to a format you find convenient. Give it a try!