If you don't like the thought that somebody else could take your hard work that you Open Sourced for everyone's benefit, alter it just enough to make it incompatible with your original, call it their property and then not release the Source Code so nobody else but them can benefit from it, then release under the GPL.

Almost any other licence will bite you in the backside eventually (yes, even the former PINE licence; which had the unintended consequence that nobody except Gentoo dared distribute it).