I understand and agree that opinion based questions are a bad thing on Stack Overflow, but shouldn't we have a place to ask this kind of question? There are so many times where I look at different frameworks and have to make decisions that will affect the next 3 years of my life without actually having all the pros and cons of both sides.
So my question is: Is there a place to ask these questions?
And if the answer is no, could that be a new Stack Exchange sub-website?
Nope. There is no site in Stack Exchange network where you can ask opinion based questions. And I disagree with your feature request for creating a site for opinion based questions because the goal of Q&A site is to ask questions to get answers not opinions.
Also, our goal is to have Q&A which helps other future users too not only OP.