9x 10k eggs strategy?

While this is definitely true, I'd still try and hatch 9 10ks on this day if you have them, and a starpiece you're willing to use. I've got 7 right now, and I intend to pop a starpiece during the community event and walk around an area with lots of lures, so the 50% more for hatches will be gravy on top of the massive increase from catches.

This exactly. Stardust is in my opinion the overall best because you're not guaranteed to get good candy and the exp is negligible compared to mass evolving.

Yeah stardust all the way since I only hatch Sudowoodo and Slakoth anyway...