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For me, the answer lies in the question of "What's your point" / "Where do you want to draw the viewer's eye?"
In the second one, I keep coming back to the GGB and the city & sky compete less with it.
In the first one, I'm more balanced between the city, sky and GGB.
To my way of thinking, I'd like to see the eye drawn to balance between the GGB & city, with the sky being rendered so that it doesn't become a focal point of its own but rather a pleasing negative space (like the fog). The reverse gradient creates a contrast point at the sky that draws the eye. While I kinda dig it ... the question is whether it is being used to balance or is it pulling away ... and that's gonna be your call what you're trying to use it for.
My call ... #1 for WB, #2 for sky (lose the reverse grad). Either way, very nice composition ... I really dig the alignment with the background bridge and the scale/balance/lines/etc. Putting your top light right at the mountain range top and cables crossing at other instersect points ... very tiny details. but I doubt they happened by accident/luck.
Here's a few changes ... notice how the eye moves a bit more toward the GGB and less toward the sky/city/mountains, changing the balance ... just depends on where you want to take your viewer ... i.e. the GGB, the skyline, the sunset ... balanced or leaning one way vs. the others.