Looking at the original post, it's a bit tough to answer. I suppose if I were to give an answer I would want to sit under Paul's ministry when he was in Rome. Any of Paul's missionaries would've been great, but I would chose what was happening in Acts 28:22-24. That would've been when he was at his wisest and fully seasoned.
I like Martin Luther and I'm a full supporter of his message he brought on grace. However, he had some errors too and even though he shed a lot of errors from the Catholic Church, he still brought a lot of them with him. I don't hold that against him, as he was just beginning to understand the things he discovered.
Paul said in Acts 20 that grevious wolves were about to enter in. Looking at what John said in the book of Revelation, we see that happening. I know a lot of people don't believe in the "7 Church ages", but aside from that, many of those Churches Paul set up. His prophecy in Acts was fulfilled. As for the 7 Church ages.... I do subscribe to that view, and along with the Acts 20 "prophecy" (if I can call it that) churches have taken a down turn since Paul, Peter and John left.
Paul also said something interesting in I Cor 13. He said he (we) know in part. But he said that when that which is perfect is come, that which is in part will be done away with. So even Paul thought there was something better than his ministry coming. I believe a big part of that "something" was the final version of the Bible. Why? Paul was speaking truth and the Word in Asia Minor and Europe mostly, Peter was in Antioch, John.... wherever he was until he was on Patmos and on down the line.... No communication between them for years perhaps. Maybe they did, but I don't think Peter ever read any of Paul's epistles, Paul never read Peter's and John neither of theirs. Yet when they were put together, we have something none of the Apostles had in a sense. The full collection!
Not sure if I explained that the best I could.... But there it is. I don't think the "that which is perfect is come" is all about the Bible. But it is a big part of it. It's more as if the Word must be accessible and preached correctly. The congregation must have access to it, be able to read it and there must be a preacher able to unfold it's mysteries and truths. I don't think this was possible until the last couple of hundred of years.
With that in mind.... There is no other Church in any other age that I would want to be in other than the one I'm in now.