Nintendo 3DS has badges, lots of themes, and other decorations and customizations for the home menu. Nintendo Switch only has a white, and a black theme. 3DS is clearly better than Switch.
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Why did more people buy a Switch? Are they stupid?
The Switch only has better hardware and doubles as a home/handheld console. It also boasts some of the best Nintendo titles ever made. I suppose 3DS does have better theme custom options but the beauty of the Switch interface is that its snappy and simple.