If you want highlights (streaks) then choice 70-30% highlights.  If you want 2 color equally blended to appear as one mixed color choice 50-50% Equally Blended.  However, please note that when choosing Equally Blended, the predominant color will be the lighter or brighter of the two colors. 

Example: If you order #1B and #30 Equally Blended as One Mixed Color-  your wig will appear to be a #30 as it will be the more predominant color.