Mnemosyne doesn’t bleed or feather, Leuchtterm is good but not as good, Rhodia is not good.
I currently write with a Parker DuoFold International in Medium (Heart of Darkness/Noodlers), two Levenger L-Tech 2.0 in Fine (Pilot Salior inks) and a TWBSI in Fine (Red/Black Noodlers).
I prefer the medium nib these days as most of my correspondence is on Lohkta paper. My drafts and notes are on the Maruman,
I am intending to fill something with Noodler’s blue if it arrives today.