Creative Commons licenses

is it better or worse than GPL? or is something like BSD license should be used instead?

FSF is essentially good. It is not "perfectly good" but it yet to be replaced by something better. Its a common error(perfectionist fallacy) to ascribe improbable/all-encompassing qualities such as ``perfect freedom' to licenses made to restrict the use of product.
The concept of licensing and copyright is antithesis to ``perfect freedom'. FSF replaces more un-free(pro-commercial) licenses by pro-sharing licenses, but it is not "releasing something from copyright".
Factors of such inherent 'unfreedom':
The modern economy of IP is based to restrict information via legal code, enforced through licensing.
People want money, and rights attributed to their creations.
Its considered pro-social and anti-individualistic to share private goods.
The concept of reification: non-material ideas become patented/copyrighted and thus controlled. Ideas are equated to tangible goods.