I've had or have most of these pens. Personally here are my thoughts:
Platinum 3776 - Writes reliably, mine is decently wet but the line is too thin which is common for Japanese pens. It also doesn't sing to me in any special way. I've got the basic black GT, which is fairly plain looking. My opinion.
Pelikan M200 / M400 - I can't speak to the M200, but for the price the M400 is just far to light and cheap feeling. It writes well but it doesn't feel like the same quality as an 800+ series. Get one, but get it used for well under MSRP.
Pilot Vanishing Point / Custom 823 / Custom 74 / Custom 912 - I have the VP, 823 and 74. You can't go wrong with a VP or 823. I find a lot of the gold nibs on my various VPs have needed work to counter dry starting. But once fixed it's an A+ pen for convenience. the 823 is an A+++ pen for writing experience
Edison Collier - I have one in addition to a Pearlette. Exquisitely finished in my opinion but I've had some flow and dry starting issues with the steel nibs. You may need some work. That said I just ordered another Collier. Beautiful enough that I'm good with the gamble.
Franklin Christoph Model 19, 20, 02, : I've had two FC pens but I don't remember the models. Can't speak to these two, but of the two I had the medium steel nibs were smooth, reliable and wet. I'd get another if they came out with a design that spoke to me.
Parker 51: Never tried
Waterman Caréne: I've had several. Nibs seem to have inconsistent flow. I like wet pens, so my wet Carenes are f'n dreamy.
Diplomat Aero: Never tried, but I have an Excellence which is a smooth wet writer. I don't know if their nib and feeds have any similarities.
Sailor 1911 / Sailor Pro Gear: I've got a Pro Gear Realo and a Pro Gear Sapporo: The pro gear is decently weighted and the nib is aesthetically beautiful. But the line is thin (as expected from a Japanese pen) and the feedback is too much for me.
Edited by bemon, 17 January 2020 - 16:03.