I went through that same choice. I really like Black Sapphire, but ive owned a few black cars in the past and as much as I like them I cant deal with the maintenance anymore. Too many issues with swirl marks, and they always look dirty. Where i live they salt the roads in the winter and we get a ton of pollen in the spring and summer so keeping a car clean is basically impossible.
BGM hides dust/dirt/ swirl marks much better.
Just my $0.02
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