I've gotten traffic from HN and /r/programming, and the influx from HN is larger. I think it's a function of two things. First, /r/programming is higher-volume (i.e., more front-page links per day). Second, Reddit subscriber counts are not DAU / MAU, it likely includes a ton of inactive accounts.
Funny I just looked and Reddit says r/programming is 4.1m which last I checked is less than the 5 million unique visitors HN was getting a few years ago when I last saw stats by the moderator and I don't know what it's at now.
Twitter works completely differently from most platforms and isn't a unified community.