Engineering at The University of Manchester, UBC, UofT VS Economics at the King's College London

I’m in a dilemma here. I recently got an offer from the University of Manchester to study engineering with an integrated foundation year, I intend to study Electrical & Electronics Engineering after finishing the foundation year. I also have an offer from UBC to study engineering and I still waiting news from University of Toronto for engineering as well. But, I was also admitted to do a foundation year at King’s College London to progress onto BSc Economics and Management.

I am very keen on both programs: engineering and economics. I got a scholarship from the Ecuadorian government and one of my commitments is to return to Ecuador after finishing my studies.Most of the people I know said that the best choice would be EE, because here in Ecuador we are trying to improve our technology and also engineers usually have the highest started salary. Some people have told me that studying economics at this time is useless, in addition there are so many economists in Ecuador. Despite all of this stuff, I am still interested in Economics. I enjoy reading about economics, and I would like to learn more about this field. When I said that, my parents say I can learn economics or management after finishing engineering, but it will impossible to learn something about engineering if I study Economics. I don’t know what to do.

I would appreciate a lot some advice!!

Which university do you think is better to study engineering? (I like U of Manchester because its location and the opportunity to explore other cities in the UK, but looking at the rankings, UBC and UofT seems to have a better reputation )

Do you think that studying Economics is useless?
Do you think I will have more opportinties as an engineer in a country like Ecuador?
Are you agree I can study something related to economy or management if I study engineering?

Thank you in advance!!!