I would choose UKIf your choices are UK or US and nothing else, US only makes sense if you intend to reside in the US and do business there. Broadly speaking, that's the only advantage a US passport has over a UK passport for business purposes.
Hungary, Myanmar, and Tajikistan as well. There are a few exception for Hungarians, though.US and Eritrea I think are only two countries that have taxation by citizenship.
Hungary, Myanmar, and Tajikistan as well. There are a few exception for Hungarians, though.