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I really don't like black/yellow, the strong colors kinda feel out of place, especially when there's many squans, like at a competition. I know this because I've scrambled squan at comps before.
I tried black top white bottom, but I didn't like the look of it. So I switched to yellow top black bottom and it feels more comforting. Probably because I'm used to seeing yellow top on 3x3 solves.