I think it may be down to the UI, for example I preferred Relay for Reddit over the other offerings because the UI just felt more natural to me and that of course always going to be down to the individual user
I was using Connect until I have found that there are trackers(via DuckDuckGo app) in it from Facebook. Trackers are common in apps, but if there are options available which give same experience without trackers, I will choose those options.