I'm in Lithuania for 1 year already, and I'd say depends on what kind of company you want to found.

Here in Baltics it's very good for B2B SaaS fintech, deep tech, and that kinda stuff.

Everywhere else e-commerse is big.

Also depends if you're bootstrapping or fundraising. Fundraising is easier if you're incorporated in Estonia, in other countries no one cares, you'll still need to incorporate in US with C-Corp.

The community in Europe is still forming imo.