It really does depend on the discipline you wish to pursue.
I took a peep at your profile and see that you are in Turkey, so if you want to choose a university where the language used is English, England could be a good choice. However, there are many universities in England. If you want to do it by correspondence, they may be offering the subjects you would like to study at London University.
On the other hand, if you want to live there while studying, some countries are considerably more expensive to live in than others.
You may find that your acceptance will depend on what you studied for your Bachelor's Degree and how you went with that. It's a good idea to get experience by doing some study in a different country from your own.
You are very brave to attempt it and I hope you do well.