Moving to US or staying in Europe?

Currently I'm finishing my university studies in Romania and my girlfriend is planning to move to US( she has Green Card) after university. In few years I will have an EU citizenship, but my girlfriend wants to marry me so I could get a Green Card as well and live in US. So I wonder is it worth to move from Europe to US, what is the difference, because i have no idea what is living life there. I like the food in Europe, the infrastructure and all shops that are nearby you. Also for me is important the quality of healtcare.