We have the small 3.5in  paring knife and the 6in chef's knife. Both work well,  but one is too small for most vegetables,  and the other is too big for my wife's smaller hand.  The 5.5in prep knife is just right for her. The shorter blade makes it easier to hold and the lower profile of the blade makes it easier to slice through vegetables than the 6in chef's knife.
I would definitely recommend this knife