This is really the only one that comes close to comparable to Bitcointalk. However, its success isn't based on its quality, in fact I would say that its popularity is because of its lack of quality. The platform is designed mainly for lower quality content, and has a visibility feature which is easily abused. However, out of the ones you listed its the closest one that comes to Bitcointalk's goal, and that's quality based discussion. Don't get me wrong Reddit can have quality discussion, but because of its nature it tends to encourage lower based quality.
I don't use reddit, so I don't know if it's worth comparing to bitcointalk or not. For the best post quality, bitcointalk may still be at the top for online bitcoin forum compared to other forum. But in my opinion between Reddit and bitcointalk have a different rating system. A Reddit user doesn't need HQ quality post to earn karma, because fame and number of followers will have an impact on the amount of karma you get. I think the same post rating system applies in bitcointalk and that is a merit. There's an emphasis on post quality as a condition for getting merit, I think it's different on Reddit. If my assumption is wrong, please correct me.