Hi, Caden
You raised an interesting question. I agree with what Elisângela said: branding an accent as better than the others reinforces regional prejudices.
There is a so called "neutral accent" which is used by mainstream television, actors, etc. It has features of different local accents, in such a way that listeners might find it difficult to spot the origin of the speaker. If you can understand Portuguese, you can google for "dialeto neutro" or "sotaque neutro" and you'll find things on Wikipedia and YouTube.
Taking into account a learner shouldn't be confused by different accents, I'd say the features of the "neutral accent" are fair enough.
Otherwise, as a foreigner you will probably pick up the accent of the people whom you have the most contact with. And that's fine.
Regards.