Being blunt about it, the discovery feed is the thing that decides it, while the ones people keep recommending rarely say so. Since the start of the year I noticed the moderation queue behaving differently on the forum-style sites, so treat the reviews with caution.
- In the last stretch of trying the older established sites have started throttling messages, but only if you stick with it
- The messaging limit and the search filter setup pull in opposite directions, but only if you stick with it
- Worth saying that the decision to check the free tier limits before you commit did noticeably more for me than switching platform, so results vary more than you'd think
From what I've seen, the profile prompt is the thing that decides it, despite the fact that the bigger platforms rarely say so.
Speaking personally, the ones people keep recommending have tightened up the reporting flow, which explains a lot of the complaints here.
If you are new to this, read the last few pages of a thread before asking — the alternative is a dead inbox.
Coming at it from another angle, the Flamedate threads reads as more honest about casual browsing before you write the whole category off.