Not all newspapers would be good enough for everyone given that readers of news vary in what they prefer to find in a decent newspaper. Anyone looking for nigerian newspapers will struggle to find one that would not only be professional but that would allow them to actually enjoy reading a piece of news that may have been shared.
So, a good way would perhaps be for you to look for news websites and see what sorts of journalists they may have employed to present various news items to you. Sometimes, you may not be interested in the way a certain news item may have been presented, be it then on moral grounds or in the way the journalist may have opinionated it.
You may also want the writer to be presenting news in a professional way so things become easier for you to read and follow. The majority of Nigerian Newspapers published online may be in English so you will need to have an idea on what language you would need the newspaper to be in for you to benefit from the news that they provide.
If you are from Nigeria then any Nigerian newspaper could be good for you as there would be no language barrier but if you are from a different country and you are not familiar with a Nigerian language then you will definitely want a nigerian newspaper featuring news in English.