I have several "favorite" pens in my stash.
I have been sketching lately and have found the Faber-Castell Pitt Pens to be my "go to" pens right now while sketching. I like the Medium, Small and X Small tips.
I also recently discovered the Pilot Multiball LM-10F-B and I really like it.
I am also using these pens for art journaling:
Uni-Ball Signo Gel Impact White pen