<p>Basically you are asking if you should spend 6 years training instead of 4 years. You won’t earn any more money as an engineer if you happen to know how to repair cars too. So you can get your first professional paying job in 4 years or in 6 years. Makes sense to me to go the vocational route later if something else doesn’t work out for you. The exception might, and only might, be if you are planning to work in the auto industry, you might have some different perspective to bring.</p>