Parent company in Delaware only for VC funding from US VCs. Final setup in Estonia for cost, Netherlands for ease of doing business and Switzerland for prestige or some intangible shit.
If you're not going for VC funding from the US, you can skip the Delaware setup and setup solely in the EU, ideally in the place where you're currently at. Don't make it all the more complicated than it needs to be. By the time you're big enough to obtain VC funding, your legal partners will have a better idea of how to structure the company.
