I fear that this will remain an issue with patent leather for a long long time. So unless you plan to enjoy and resell quikcly, I recommend the darker colours. But if I think about it, almost all new colours are quite light pastels

The point is that a centuries ago the original patent leather was achieved by a linseed oil solution, but when plastics came to life, oils were replaced with plastic all across the board. Even in high-end goods. I don't know the complete reason, but most probably way easier and quicker to manufacture, also longer lasting, better quality. The only downside is discolouration. Old patent leathers were mostly black or brown. But on these new fancy colours, age does show. The coating is clear PVC. And clear PVC tends to get a yellow tint with age as the Sun's UV rays break down the polymer chains in the plastic.
Clear phone cases also use clean PVC, they practically have to. The last news a few years ago, when Apple introduced their own clear cases, they said that they engineered a polymer version that will be less prone to yellowing. Well, it didn't turn out to be effective, and also they probably meant that the case will survive a year. But a Speedy should be OK for more than a year.