So. Many. Markers!

I have really tried a lot of markers (and pens)!  The main things to consider when choosing markers are: nibs, smearability, toxicity, and cost.  You may also want to consider the sustainability of the markers (some that I discuss are refillable).  First, I will describe the characteristics of excellent drawing tools.  Second, I’ll break my recommendations into two categories: black markers for outlines and colorful markers for fills and shadows.

CHARACTERISTICS OF THE PERFECT PEN

Nib thickness / shape.  I like to use a bullet nib for the black outlines in my visual notes.  You can also find small markers with a calligraphy nib or a brush nib.  Large markers have brush tip, chisel / wedge nib, and bullet nib.  To be honest, I struggle with nibs.  I draw relatively large, so I want something for sketch notes that is relatively fine (0.7-0.8 mm would be ideal for me) but not too fine.  Other sketchnoters like to use fine nibs and you can buy a SketchOne set (made by Staedler) from Neuland that has a variety of nibs (0.1, 0.3, 0.5, 0.7 mm).  You’re going to have to experiment with nibs.  I use chisel nibs for writing on wall charts and usually use brush nibs for color fills and shadows.

Smearability.  I like to draw black outlines and then quickly add shadows and color fills.  Because I like to work quickly, the black outlines are not always dry when I add color.  If I add yellow on top of black, I can sometimes get some wicked smears that make everything look murky.  There are several types of black markers, but a few common ones are alcohol-based ink, water-based ink, and pigment ink.  My experience is that the alcohol-based ink (i.e. Sharpie, Bic Marking Pen, Prismacolor, Copic markers) smear the least, water-based markers smear the most, and pigment-based markers are in the middle.  I did an extensive black pen test to find the least smeary black marker.

Toxicity.  While the alcohol-based markers are fantastic in the variety of nibs and non-smear categories, they are terribly stinky and feel toxic to me.  They also bleed through the page.  I occasionally use Sharpies to draw sketch notes, but not often because they make me nauseous after about 15 minutes.  I gave all of my Prismacolor markers away because I couldn’t even tolerate them for 10 minutes.   If you can tolerate the stink (or work in a well-ventilated space), graphic designers and illustrators LOVE Copics and Prismacolor markers.
 
Sustainability.  Most markers are disposable.  You throw them away when they run low.  Some markers are refillable, but these are rare.  Water-based markers are probably the most environmentally friendly option because they are non-toxic.  The downside of water-based inks is that they are not as archival as other markers (they fade in sunlight). 
 
Cost.  If you are drawing sketch notes, you probably won’t go through markers so fast that cost is going to be a big issue.  I draw about 50 square feet of sketch notes each month and I go through about 1 black marker and 1 color marker each month (on average).  However, if you draw a lot of large wall charts, it adds up.  You can shop around to find the best deals on markers and pens (because different places have different sales at different times).  I buy markers at my local art stores and also shop at DickBlick.com JetPens.com Neuland.com and Amazon.com. 

PERFECT PEN RECOMMENDATIONS: WALL CHARTS

Black outlines. My go-to markers for black lines on wall charts are Neuland Outliners. Period.  They are just amazing markers.  I love that they are refillable and non-toxic and don't smear.  Honestly, I do not know how they do it, but the Outliner ink is amazing. It reminds me of India Ink (and may be!).

• FineOne Outliner.  This has a 1.0 mm nib and I use it rarely on wall charts. Sometimes I use it to write commentary in small letters. I also occasionally use it to add fine details. 
  
• NoOne Outliner.  The "number one" comes in a few nibs.  I like the wedge / chisel nib for writing text.  I use the round (bullet) nib for drawing doodles.  Sometimes I mix it up and use both.
  
• BigOne Outliner.  This is a huge marker and great for titles and borders.  I also use colorful BigOnes for shadows and coloring in large block letters.
  

Colorful markers.  I alternate among a few types of markers for wall charts, but will only discuss a few here.  If you don't want to order fancy markers, you can get a lot done with three types of water-based markers that are available at most office supply stores: Crayola Multicultural Markers (for coloring people), Sharpie Flip Chart Markers, and Mr. Sketch (a.k.a. smelly markers).  The Sharpies and Mr. Sketch are easy to find in bullet nibs, but search for chisel nibs because I have seen them.

• Charter Markers from the Grove (red marker in back below).  These markers are water-based, have big wedge nibs, and are juicy!  The ink flows from these guys like no other marker I've found.  They are relatively expensive and the black ink smears like crazy, but I love them for times when I am writing in color.  They are also great for coloring large swaths of paper.
  
• Neuland markers.  I like the ArtMarkers best for coloring in sections of a chart, but the BigOnes are also handy for drawing shadows, connectors, boxes.  I don't use my colorful NoOnes that much (red marker in front below), but other visual practitioners love them.  As far as the colors go, I would start by ordering a few basic colors (either red, blue, green, gray OR turquoise, pink, lime, yellow, gray) and seeing how you like them.  I bought a color set (#6) as soon as I got started, and I have never refilled most of the markers.  We all have our favorite color palettes and it might take you a little while to find yours. 
  

Everyone has personal preferences when it comes to art and office supplies.  Try a few things out and let me know how it goes!