Unfortunately the focus is slightly off in this image, but it gets the point across.  This is a comparison of the difference between GW’s Devlan Mud wash on the left, and Army Painter’s Strong Tone dip on the right.

Both figures were painted with the same base coat colors in the same areas, and both were sprayed with Army Painter dull varnish after they were dry.

Overall, for these colors I prefer the Army Painter dip.  It darkened the colors a bit less, and stayed in the cracks a bit better.  The black on boots and gun were affected less by the Army Painter dip than the wash.  I also don’t like how it deadened the green helmet.

I really like Devlan Mud, and I will still use it in cases when I don’t want to wash the entire figure.  But Army Painter works really well.  It’s almost depressing how good a job it does, compared to making an effort.

The colors, for reference, are all Vallejo except the black which is a craft paint.  They were selected based on the Flames of War painting guide for Russian infantry:

• Russian Green helmet (894)
• Khaki Grey uniform (880)
• German Camo Beige for the straps and gear (821)

Unfortunately you can hardly tell the difference between the two khakis used for uniform and belts.