I live in the UK and have a couple of university degrees from good UK universities. I know that many students come from abroad to study here, and that Oxford and Cambridge are very well-known throughout the world. However, I don't have much experience of universities in other countries, so I can't say very much about how our education compares to that abroad.
My only other university experience was in France. The uni courses that I took there seemed to be a lot more about learning things by heart, and not much about comprehending and analysing things, or giving our own opinions. This was very different to my experience in the UK, where we were frequently asked to say what we thought about things, and give our own interpretations. Learning things by heart was probably easier, but it meant that I came away not remembering so much about what I'd learnt!
So personally, I preferred the UK university system, but that was just from my experience of the courses that I studied.
I suppose to get an accurate idea of whether the UK or USA system is better or holds more weight, you could try asking employers which they prefer.