George,
You might want to assign a colour profile to the PS version before anybody tries to make a comparison. The PI image already has a sRGB colour profile.
Either program is perfectly adequate to produce great astro images. I'd recommend playing with both and then deciding suits you best.
PI provides a lot of astro specific tools and is extremely powerful but it doesn't suit everybody. Some people hate the UI and others are put off by all the knobs and levers.
PS is light on astro specific tools, though some are available as plugins and macros, but has fantastic general image processing capabilities. I'd argue that PS is pretty hard to use too but it is well documented and a lot of people are familiar with it already.
You can mix and match and I used to finish off my images in PS. These days I find I can do everything I need in PI.
If you find you are struggling with PI, another option is CCDStack. It is quite easy to use, at least IMHO.
Cheers,
Rick.
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