It is very difficult to exactly answer this question as every Country has its own pros and cons. An International Candidate must consider the following points before reaching out to some Conclusion.

Level of Spoken English, Universities Ranking their International Acceptance and Over all Education System, Availability of Scholarship for International Students, Job Opportunities, Legal permission to Work, Option of Family Settlement, Post Work Options, Ease of Visa Extension or Conversion in to Work and option of getting the passport of that Country are all the necessary points that should be considered to find the answer to the question. Which Country serve as the Best Study Destination also depend upon Candidate specific goal, preference and objective. The Country which serves Candidate specific preference the most should be the best study destination suffice to say.