I was leaning towards Aonibi too. Shin-kai is a workhorse, a very well performing ink, but Aonibi is a little more saturated and shades a little more. I also love watching it dry from royal blue to a dusky blue.
I recently got in on a Massdrop drop for 3 bottles of upper end ink. Some Iro Kon-Peki, Montblanc Lavender Purple, and Pelikan Edelstein Mandarin should be coming my way in the next century
The supposed Blue-Black Platinum ink that came with the 3776 is pretty underwhelming. Doesn’t shade a whole lot and dries to a rather boring shade of blue.
Does anyone have a TWSBI ECO or ECO-T? I got an ECO-T. Its nice. Writes well. well built, i like the screw on top and the butter o-ring to keep it on the end when you’re writing with it.
I used to have an Eco (non-T). I really liked it, build was good and it is a good price IMO. The stock nib is stiffer than I liked, but I had another nib that fit.