Pen VS Brush

LEFT ONE: Nankin Pen + Nankin INK with water  |  RIGHT ONE: Nankin INK with Brush nº2 and INK and water.

I'm trying to decide what style should i use for a comic page about Oxi, a dangerous and famous drug here in Brazil. That guy is a honest policeman of the story (Yes, i have to say honest) that discovers interesting new perspective about the origin of the drug. So, What style should I choose? Leave a comment with your choice.