What else do you have or plan for the tank? Light or dark it really depends what your trying to do as both have adv/disadv.
Once your put plants in and lighter hardscape a black substrate shouldn't look stark. Light colored substrates like pool filter sand are great, I use them all the time, but they also show everything and can become an eyesore if the tank isn't maintained properly. Dark substrates also make many fish and plant colors pop more.
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