It would depend on the illness (how well-known or rare it is), and whether it was affordable without insurance in the States. I hate to say this, but most of the cutting-edge medical research these days is done in the States, simply because the hospitals and researchers get the money to do it. In my case, with a rare joint disease, my only NHS option is to have a total hip replacement (they last only 10 to 12 years, and I'm 39--it's not a procedure I'd want done several more times). In the States, where a doctor at Johns Hopkins is the world specialist in AVN, has written a book about it, and has taught two British surgeons how to do a procedure called femoral head resurfacing, health insurance would cover it. It's still considered "experimental" here, so the NHS won't. So in either country, it's going to cost about $20,000. Given that, I'd rather have it done in the States (I no longer have U.S. health insurance, but all things being equal, I'd rather go with the specialist at Johns Hopkins University). I've also heard a lot of horror stories about having babies here, with the NHS, so I wouldn't even consider having a baby unless I did so in the States, should I ever have kids. So, to give the short but final answer, I trust physicians in the States more than I do here. No offense is intended to anyone, so please, no verbal assaults.