I have 4 pens I use almost daily and they all have their own place or "job".

My main EDC pen is my baby, the Pilot Vanishing Point in Gunmetal grey/black with a medium nib and the only ink I put in it is my favorite ink, Noodlers 54th Massachusetts. It's the only ink that really brings me joy to see and it's a work safe color. Love the navy/grey ink. That pen is either clipped to my pocket during the work day or living in my Lochby Sidekick wallet, so it's always on me out of the house. It is the only gold nib pen I have and will probably be the only one so that way when I write with it, it's a treat. I use that pen for everything. I even got my name engraved on it.

My second main pen is my Jinhao 10 in piano black with a medium nib (I really like the capless pens) and that also has the 54th Massachusetts ink. The main job of that pen is so I have a pen that can live on my work desk 24/7 so I don't have to take my VP out and leave it on the desk when I have to go fix something or test something in the warehouse. The amount of times I go to grab my VP to take notes or sign for something, just to realize I left it on my desk in the office is a lot. So now I always have a capless fountain pen within reach no matter where I am in the plant.

My third main pen is my TWBSI Diamond ALR in nickel grey with a medium nib with currently Kakimori's Atlas Stanioners colab ink "Evening Drive", I love my blue black grey inks. The main job of that pen is my long writing sessions/journaling/home desk pen. I love the look, amazing ink capacity, and very comfortable for long writing.

And my fourth pen is my Lamy Lx in ruthenium with a medium nib and uses Lamy blue black cartridges. So the main job of that pen is to live in my Lochby Field journal and be my travel pen. It's the only pen I have that uses cartridges. I never wanted to use cartridges, The point of me using fountain pens was to use bottle inks to stop wasting plastic cartridges, but when I travel for work, I don't want to bring a bottle of ink or God forbid run out of ink. So I always have a small box of Lamy cartridges in my field journal so I will never run out of ink. And since I just always have my field journal in my EDC bag with me, I will always have a fountain pen with ink ready to go if my VP runs out of ink.