Interesting . . .
A close inspection of your images shows that the new technique
appears to show enhanced detail in the dark brown nebular regions
with less noise (and fewer stars, too) apparent overall . . .
However, I prefer the first image. If you ask me, it really has more
detail and more original information in it than the second image,
even though that detail is of lower contrast.
The second attempt seems, in general, to suffer from smoothing or
blurring of higher-frequency detail, and is artificially boosted in
other frequencies, such as the brown nebular region and high
luminosity central region, which enhances contrast, and which is
probably the goal of your processing effort.
That's just my preference, though. As Ron W. says in his book, there
is no right or wrong answer, it's just a matter of personal
taste/preference.
Borrowing from my experience in studio photography and media in
general, it's also worth mentioning that what makes an image "better"
than another is largely defined by its intended purpose and final
display medium and scale (print, monitor, mural, T-shirt).
Critique notwithstanding, nice work on both attempts.
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