The idea behind Creative Commons is to make it easy to distinguish between the different licenses, and the license selector also makes it easy for those who are completely inexperienced users of CC to determine the correct license. Some licences are more open, also called free culture licenses, others are more restrictive. Statistics from 2015 shows that most of us choose the free culture licenses, and that is great news for all that love to re-use and re-mix.
I get many questions on how many limitations you should choose to associate with a picture, video or text. There is an axis between more open licenses with few limitations and the most restrictive ones that have limitation on derivatives and commercial use.
The License CC-BY and CC-BY-SA (includes CC0) is often defined in a separate category licenses that support the “free culture.” This is a good thing because it provides even greater freedom for those who want to reuse, even for those who engaged in commercial activities.
My advice is that you should use free culture licenses as often as you can. The anual statistics from Creative Commons shows a clear trend that these “free culture” licenses are the most popular ones.
The most popular license is CC Attribution-Share Alike (BY-SA). 37% of all work published are released under this license. By comparison, only 14% have chosen to use CC Attribution-Noncommercial-No processing (CC BY-NC-ND). One of the most restrictive licenses.