Alright, another post you asked for. My method of choosing inks for my pens is part data-driven, part personal preference. Ultimately, the actual “choice” of ink is only mildly influenced by the data-driven aspect. So, if you want to skip the data-driven bit, you won’t be missing out on too much.
Like with my pens, I try to ensure I use all of my inks. To do so, I have an Airtable view set up for ink usage. Every time I ink a pen (not counting my “always inked” pens), I check off the ink I used. I only let myself use an ink once per notebook.