You can see from the screenshots that QGIS has, in my opinion, much more pleasant on-screen rendering of vector features. I assume there is some sort of smoothing algorithm used in QGIS. Is there a way to replicate this on-screen smoothing effect in ArcGIS?
(click images for full effect)
ArcGIS for Desktop ArcMap 10.2
QGIS 2.2 Valmiera
Answer
The effect that you need is called Anti-Aliasing.
When ArcMap draws a diagonal Line, It will draw all pixels. This gives rise to what is colloquially called the staircase effect. When QGIS draws a diagonal lines, it makes the outer pixels of a colour with lower intensity, which gives a smoother appearance.
Unfortunately, there is no option to enable Anti-Aliasing in ArcGIS desktop. You should upvote these two idea for requesting this feature:
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