Otherwise I'll click for the discussion, and then read the article when I get to that tab (ok, most of the time read the article - I've been called out before for not reading then making stupid comments - I try to avoid that now).
Sometimes on those that I read the article first and there isn't any discussion, if I liked it then I'll add a comment and upvote it. Otherwise I'll leave it alone, unless it looks like spam or something weird (if I see those, then I look at it carefully and make a judgement to flag or not).
I may middle-click both, opening them both in tabs.
I may skip either. Sometimes I just want the article. Sometimes I know what is in the article just from the title, so I just want the discussion.