As we know, soda glass contains more soda ash (Na2O) and less boron and silica than neutral glass. 

Glasses with a high percentage of boron and silica are known as borosilicate glass.  Soda glass is less tolerant of rapid temperature changes and has an active surface chemistry rather than an inert or neutral glass.  The surface chemistry is assessed by measuring the hydrolytic activity of the glass with water, i.e. is it affected by water?  Water has a far greater reaction than most acids.  Soda glass is cheaper and easier to form and cut, it is correspondingly less expensive and is adequate for many purposes.  Customers using glass vials for diagnostic purposes or as dropper bottles will need to use neutral glass.