My advice is find a PhD you want in Norway or the Netherlands. They have programs with competitive research groups, salaries that will get you a quality of life you will appreciate, they will end in 3-4 years, and they have money to pay for you to go to conferences, etc without you having to fight for it from your adviser. Everywhere else sucks.
This comment is based on my experience working as a scientist in academia in USA, Japan, Germany, France, Norway, UK, and now the Netherlands.
Add Luxembourg and Switzerland to that list - at least EPFL and ETH. It's so unbelievably better to be at an institute where travelling within Europe is simply not a budgetary problem at all.
Your experience at ETH might vary a lot though. Their PhD programs are extremely heterogeneous between departments and vary from modern, well structured grad schools to the old-fashioned central European style where the student are basically at the mercy of their advisor for five years.
Currently the salary is not competitive however Poland is the shining star of Europe given their growth and everything else these days. I might go there if science funding becomes more inline with other European countries.
This comment is based on my experience working as a scientist in academia in USA, Japan, Germany, France, Norway, UK, and now the Netherlands.