Ask HN: Where do you ask best practices / library choice questions?

Where do you guys ask opinionated questions such as: "Is there a tool/library that does X"? or "what is your best practice to do Y" in other words, questions that will be closed as non constructive in Stack Overflow but are still valid questions that you want to get other programmer's experience on? Is there anything other than HN, slant.co, Quora, reddit that has a large audience and these types of questions are welcome? Do you simply send to mainling lists of specific topic groups? In other words, in many times I need advice from people like me who have been in a similar situation and I don't have any issue with specific coding / syntax etc, more best practices. Any other places I've been missing?