GPLv3, as it protects from patent trolls and also encourages creating an better ecosystem. There are companies that refuse to use GPLed code. They want to modi

GPLv3, as it protects from patent trolls and also encourages creating an better ecosystem. There are companies that refuse to use GPLed code. They want to modify and then sell closed forks of your product, without paying you, and by doing so they fragment the userbase. GPL prevents this. If you want to allow them to do so you can always switch to BSD or dual-license - perhaps after a private agreement and if you find the companies reputable.