There is no 'right' or 'wrong'. Proper is up to you. If you live in Europe, Portugal's portuguese may be better. If you search for a job, maybe here is the right place. The fact is, Brazil is a growing country, instead of Europa and USA. For sure you won't lose anything if you learn Brazilian's language. it depends on each person, where do you want to go, with who do you want to talk, or if you just want to learn something for your work. But there is not so many differences between them. If you speak one of these two, you will be fine in both places. Also, you should think if other languages aren't better. Learn one language because of one or two country isn't something I'm looking for. But as I said, it's up to you ;)