Which university is better - University of Mauritius or Middlesex University?

UOM for research. Middlesex doesn't sucks in administration. If you are into Science it's UOM. Law especially british and EU law, then middlesex. UOM isn't recognised in Germany. You can't get a work with UOM degree in Australia but you can do a masters.

Middlesex university is better than UOM because it is a British university( and has been involved in a lot of research) and its degree is more recognized around the world than UOM. Going to a british university make you have an edge over people who have studied in local university for example many companies in Dubai employed( look for) people who have studied in a british university( google it yourself, you will also noticed many companies in dubai mentioned that they prefer to employ people who have studied in a british university). Also, since middlesex is a british university, doing a bachelor degree takes only 3 years compared to UOM which is 4 years, a master at only 1 1/2 years , hence saving lots of time :P .
However, middlesex is way more expensive than UOM, so you will have to make a financial plan for your studies and asked your parents if they will be able to afford it.
Anyway, I have a high preference for british university because they offer better services and it reflected on your work, also before getting your degree, your grade will go through a board of assessment( that is your mark will be reviewed by someone in middlesex, UK then they will send it to another university to comfirm your grade...so this makes your grade more accurate and reliable..and employers know about those stuff) so if you can afford it, go for it!