You can kinda tell this from popular yo-yo drops in solid colors. For example the Metal Yeti sold out in this exact order:
- Purple (big time fast)
- Black
- Blue
- Silver
- Gold (by a large margin, the least desirable color)
Unfortunately there wasn’t a red in there, but I suspect red would do about as well as Black, e.g. it’s almost as popular as Purple?
You can also kinda tell from the Mantis and Marquis blind box ratios, too, that these colors were expected to be the most popular:
- Red
- Black
- Blue
- Green
(Not offering purple was a big mistake though 
… I personally would say purple is the most consistently awesome color in anodized aluminum. Sorry it’s not pink @chaosgow but… it’s related? )
Let me ask @da5id – when you make solids, which colors consistently sell out first? and I’m sure @YoYoExpertGarrett can speak to this too, or @MrYoyoThrower?