Pursuing masters in UK has got several advantages over pursuing the same in USA like:
1.Duration of the course - It is one year in UK while it is 2 years in USA
2.Course Fee- Drastically less in UK and Australia compared to USA
3.Communication - Students from other countries are good at British accent compared to American
4.Travel expenses are lesser in UK
5.Affordable accommodation in UK
Well, the main reason why people prefer pursuing masters in the United states of America is associated with the "Quality of Education". Quality is the thing that ultimately decides the future of you and as per the opinions of many people, the quality of education is USA tends to be the "BEST". You may complete your masters within a year in UK but the knowledge you gain is very limited as per the arguments and you may need to do a PhD later on to grab a deserving job while many state that a masters in US is almost equivalent to a PhD and if you have got the required analytical and technical skills, you can earn a fortune.
People get a chance to work for their own university as research assistants in USA where they not only earn money but that the experience really counts and adds a great value to their profile. The money that you earn part time is definitely higher in US compared to UK. The exposure you get is more as you get to meet people from many different countries.
Those who could not get a US visa are looking for universities in UK. The process of getting an admit in UK is pretty easy, simple and a student who has very poor academic details and scores can also get an admit with ease. This is also an indication of the quality of education in UK.
This doesn't mean that all the universities in USA are better than that of UK. There are also highly reputed universities in UK where it is not easy to get an admission. It is better to take the entrance tests required for getting admission into both US and UK universities, make a list of all the universities in both the countries that you can get. Find the best one in both the lists - UK and US. Now, compare the two universities in several factors like course fee, quality of education, duration, part time etc and then chose the university.