Procreate Brushes
If not using Procreate’s default brushes, I’m likely using brushes from Jingsketch - their basic set has most of my favorite brushes in it and I’d highly recommend grabbing it.
I also love The Quintessential Thick Pencil Brush for Procreate by fossilforager - it’s like a softer 6B Pencil and can easily be used for a whole piece.
As for Procreate brushes, 6B Pencil and Dry Ink are the two I gravitate towards the most!