I think that that family of threads could be interesting, as long as it doesn't turn into bashing of XXX denominations (for the various XXXs).
Doctrinal truth is important, but I think much of the picture is that various denominations, or even various congregations within denominations, are a better/worse fit for different individuals. Some people thrive on liturgy, while others find it stifling. Some people thrive on long sermons, while others find them a chore. And so on. As we speak the truth of the gospel, it's good if we can speak in ways that people can hear, and that's different for different hearers.
In this thread, we're hearing from previously-Catholic folks who found that they heard the gospel more clearly in the language of another church.
A different thread might invite the stories of those who moved in the opposite direction, people raised in Protestant traditions who joined the Catholic church, because that's where they heard the voice of God most clearly.