Black ink. Sigh.

It's time for me to get a new bottle of black ink. I've narrowed it down to this quartet:

Skrip Black
Monteverde Midnight
Diamine Onyx
Namiki Pilot

Which of the above is blackest, laying down a smooth dense line that doesn't feather AND which plays well with many different pens?

(Unless there's a MV ink I haven't thought of). Already owned:
JH Perle Noire
Pelikan
Quink
Levenger Raven (horribly feathery, apropos I guess)
Chesterfield Obsidian (really a gray)
Waterman
MV Black Ash
Vintage MB that I hesitate to use too often

Thanks for your help!