Study language is the most important factor in choosing where to study is the language in which you wish to complete your studies. Making your mind on the language will help you narrow your choice during your destination selection.
If you have picked an English speaking destination you will probably be interested in the top 3. USA, UK, and Australia respectively have the highest number of international students. The UK and USA have an excellent reputation, their institutions account for the top 10 universities in the THE rankings.
Also adding to the top 3, Germany and France are popular destinations for International students. Malaysia, China and Singapore are more recent destinations that are actively chasing International students and have study programmes in English.