One of the most positive aspects of going to an English language course in Ireland is the work permit. In an English language course, you will not see anything very different from what you will see in every country. So it is not correct to say that one course is much better than the other. English is not a language that changes from person to person. But practice is more effective than courses. I think it's also best to work in a job that forces you to practice. That's why I think it's wiser to go to an English language course in Ireland, where you will have a work permit.