Which technology should I opt in computer engineering (IOS, android, web development)? I want to pursue Masters in USA or Australia.

Hi, All the three mentioned technologies are highly in demand but to be specific IOS is in lead. Though you would find many devices working and people using Android and have many more features than IOS, keeping android as a second choice won't be regretful.

If you are going for USA/Australia, then I would recommend you to go for web development and iOS, because majority of their audience use phones. So, you'll be able to create apps for your local audience at that time of your master's degree. Android is majorly used in countries like India and Brazil.