How can one compare a postdoc position in Europe and USA? I am an EU citizen, and 27 years old. I completed my Bachelor's and Master's in Electrical Engineering in the UK, now finishing up my PhD (in EE as well) in the USA.

I am currently applying for postdoc positions everywhere (EU and USA). I have, for the most part, adapted to life in the USA over the four years that I've been here. However, I am motivated by the idea of doing a postdoc in Europe, partly because I believe the overall culture there suits my personality more, and partly because all of my family is there too. I also want to experience the European way of conducting research (since a Master's in the UK didn't really involve all that much research).

My question is: now that I am still in the USA, and can get a work permit for 2 or so years easily, I am thinking that it would be a good chance to stay a bit longer and experience a postdoc here instead. 

In general, I am quite adaptable and I don't have too many set expectations. I just want to conduct interesting research and have a somewhat decent social life to keep some sort of a balance. Money is not really an issue. Also, although I do not like to plan too much into the future (because you never really know what happens), I guess being considerate of the opportunities/prospects a position can offer in the future is healthy.

Given this information, what do you are the pros and cons of Europe vs. USA for a postdoc? Answers to this question probably require some over-generalizing, so I apologize in advance for that.
Let me list a few pros of doing postdoc in the US:


In many EU countries a postdoc in the US is considered to be more prestigious than a postdoc in Europe (assuming that the places you do the postdoc in the US and Europe are at roughly the same level), so a postdoc in the US is in general not likely to harm your academic career should you eventually decide to return to Europe
If you give staying in the US a really serious thought, the postdoc in the US allows you to initiate the application for green card; getting the latter will give you unrestricted access to the job market in the US (academic or otherwise), in addition to the EU one, which comes in handy on many occasions.
Given that you have your Ph.D. (and hence the largest part of your academic network) in the US, you have somewhat better odds at succeeding in securing a postdoc in the US (e.g. because the US people you will apply to are in general more likely to know your advisor than people in Europe, and the people in the US will be less hesitant to, say, give a phone call to the authors of your recommendation letters to find out additional details if need be).