Joining British Citizenship will allow your to travel 155 countries without Visa. You can vote. I can settle in other EU countries without restrictions. However, you will lose your Chinese Citizenship. China is not an immgrantion state. It is much harder to gain a Chinese Citizenship than UK. In other words, if you want to be Chinese by law again, it will be almost impossible. You decide by yourself! I understand your feeling as I have the same problem. This is a cross road, which no one knows the road leads to. Take your coin to decide, if I were you.