ProductHunt vs. HackerNews

This is obviously a bit of a meta topic seeing as how we're on ProductHunt now, but I'm curious if others have had the same experience as I saw with SimpleID [https://www.simpleid.xyz]. We launched on PH three weeks ago and we *still* get decent traffic every day from that launch. However, we've now tried to launch on HackerNews twice with very little traffic coming on launch day and zero traffic after launch day. I had one product get a ton of traction on HackerNews last year, but that seemed very much like a fluke. So all this really to say, I feel like there is no strategy to posting on either site that truly works, but ProductHunt just has a better community and better discovery. Thoughts?