From my past experience, it goes something like this. If software is GPLv2, it's penalized relative to more permissive options when it comes to picking one. In

From my past experience, it goes something like this. If software is GPLv2, it's penalized relative to more permissive options when it comes to picking one. In practice it means that it's avoided unless it's "too big to avoid", or because the very nature of what you're doing requires it - this is the case for e.g. Linux and R. If software is GPLv3, it's considered radioactive and is avoided at all costs, even if it means rewriting large amounts of code from scratch.