Honestly, if you are thinking of this purely in terms of whether or not you can make a ‘return’ in a certain period of time, this decision probably isn’t for you.
When it comes to applying for university, the main reason you do so is to acquire a certain skillset or qualification which allows you to be eligible to work in a certain sector that you really want to be a part of.
Of course we would all like to also make a decent wage after university, but that is never ever guaranteed no matter what course you do. There are too many factors - such as how well you did at your degree (I.e what classification you achieve - 1st, 2nd, 3rd etc), where you choose to work in terms of the company and geographical location, and what your life style is like in terms of living expenses when out against your income. There is just no guarantee.
As someone interested in study abroad such as yourself, your main priorities would surely be the quality of education you receive and the experiences you have living in another country? If you are only doing this in order to ensure you ‘recoup’ your spendings, this isn’t the choice to make.
It is simply too vague and open ended a question to base your decision to move abroad on. If you are that worried about making a ‘return’ on your money, might we suggest you study somewhere closer to home, or somewhere you are eligible for grants and benefits?