Reddit definitely has its advantages. It's good for live threads of current events, and I use a subreddit to follow the Syrian civil war very closely. There's a lot of interesting stuff in reddit. In those areas it's better than TSR.
The problem is that with some of the larger subreddits (like askreddit) you often don't get to threads quickly enough to be able to do much. Once a thread gets past a few hundred comments, there's little chance of anyone upvoting or responding to a comment you post - you have to get into a good thread early if you want a decently upvoted comment with a lot of replies, especially with the time difference because reddit is quite an American website. In the quieter subs that's not a problem though.