I voted for current character posts because for some reason I found it was really hard to convince anyone who wasn't already involved in Marina some way (friends with people in the game, previous players no longer with us, etc) or another to come play in the previous format--the system of "sign up to join the comm and post!!!" turned them away really bad. And I personally agreed that it feels like it's a little TOO structured for something that's supposed to be truly open to everyone and fun and cracky.
Reading up on the comments, you said that the system HAS always been a mixture, but I don't think it comes across that way? Last time I remember, I really felt like unless you were joined up to post there wasn't that much openness to do anything else. So idk, ideally I kind of want a mix of things that's more clear if it comes to visitors posting.
With current characters posting + a mingle post, there can also be the option of visitors that want to post being able to do that by either poking a mod or signing up to be accepted to the comm if they want to, but it shouldn't be required, the main format, etc., imo. ... I am probably making no sense but anyway yeah, definitely leaning to at least trying out a new format.