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I prefer the colors in the second image. The default GSC graphics look a little too bright. However, assuming your game has a clock system, the second image looks a little dark if that's supposed to be daytime. That looks more like an evening version.
If you can, I'd go with the second color scheme and try and lighten some of the tiles a little bit.
The second one feels more easy on the eyes to me. But this is from someone who did not play the original Gold and Silver games, so others will probably think differently.